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The body uses the same energy and material wasted through sexual activity to heal itself. Take note though, that to truly reap the fruits of the practice you must be mentally chaste as well. Physical abstinence is the first step but mental celibacy is the real celibacy. By restraining yourself physically and letting the mind run wild you will only be cheating yourself.

Here’s a list of benefits you can expect to experience from brahmacharya. These are based on my experience and that of others. Do a little research and you’ll find plenty of people reporting similar benefits.

Better Eyes – Eyesight improves considerably with the practice. And it’s not just the sight that improves but also the endurance of the eyes. You can then spend hours in front of your computer without your vision getting fuzzy and/or your eyes getting tired. In ancient times they used to say that “masturbation causes blindness”. It’s an exaggeration but there is a connection between the two. The floaters around the eyes also reduce or disappear completely.
Blissfulness/Contentment – You will start to feel bliss, which will cause dispassion and distaste for sensual pleasures. Sometimes the bliss is so great that you lose interest in everything around you. To increase this bliss it’s best to practice self-inquiry (hold the I thought-feeling) as taught by Ramana Maharshi. The bliss is similar to the pleasure you get from sexual activity but more refined (subtler). It’s better because it’s continuous, and has an invigorating effect on the body.
Courage/Fearlessness – Fear reduces a lot. It’ll become hard for you to be scared, even of dangerous things. In a dangerous situation, you’ll be aware of the risk but you will also be able to deal with it carefully instead of panicking and worsening the situation. You will start to feel what real masculinity is like.

Better Memory – You will find it easier to remember things and you will also remember memories which you had long forgotten. Never mind old memories, you will also start to remember dreams which you had a long time ago. The mind will become much sharper.
Better Immunity – The energy reserves of your body are much higher now so the body will find it easier to deal with illnesses. It may happen that illnesses actually increase in the beginning with the practice, probably because of the body healing itself from ailments, but all will be better in time.
Intuition/Spontaneous Understanding – The mind becomes incredibly sharp and able to grasp things easily. You’ll start to understand things intuitively without thinking about them. The answers will come to you naturally on their own.
Lack of worry – Your worries reduce greatly. You will actually start to find it difficult to worry because you feel perfect or close to perfect. This will give you a sense of security enabling you to deal with difficult situations without worrying.
Confidence – You’ll develop vigor and confidence. Shyness leaves you and you feel comfortable with yourself. The increased confidence can easily make one conceited so be careful.
Lack of Anger/Irritability – The greater the bliss, the greater the inner peace. The blissful feeling makes it nearly impossible to get angry. Suddenly everything’s fine. Nothing bothers you anymore.
Suppleness – The body will become more supple and flexible. Notice how flexible young children are? They haven’t wasted their vital force as much as adults and so their bodies are strong and supple.
Calmness – An indescribable inner calm develops. You will develop the virtue of patience quite naturally.

The value of semen

 
My dear brothers! The vital energy, the Veerya that supports your life, which is the Prana of Pranas, which shines in your sparkling eyes, which beams in your shining cheeks, is a great treasure for you. Remember this point well. Veerya is the quintessence of blood. One drop of semen is manufactured out of forty drops of blood (Ayurveda says out of 80 to 100 drops of blood). Mark here how valuable this fluid is!
 
A tree draws the essence or Rasa from the earth. This essence is circulated throughout the tree, its twigs, branches, leaves, flowers and fruits. The shining colours and life in the leaves, flowers and fruits are due to this Rasa. Similarly, the Veerya that is manufactured by the cells of the testes out of blood gives colour and vitality to the human body and its different organs. 
 

How is manufactured the semen?

According to Ayurveda, semen is the last Dhatu that is formed out of food. Out of food is manufactured chyle. Out of chyle comes blood. Out of blood comes flesh. Out of flesh comes fat. Out of fat comes bone. Out of bone comes marrow. Out of marrow comes semen. These are the Sapta Dhatus or the seven Dhatus that support this life and body. Mark here how precious is semen! It is the last essence. It is the Essence of essences. The Veerya comes out of the very marrow that lies concealed inside the bones. 

 

Semen nourishes the physical body, the heart and the intellect. 

There are three divisions in each Dhatu. Semen nourishes the physical body, the heart and the intellect. Only that man who uses the physical body, the heart and the intellect can have perfect Brahmacharya. A wrestler who uses his physical body only, but keeps the intellect and the heart undeveloped, cannot expect to have full Brahmacharya. He can have Brahmacharya of the body only, but not of the mind and the heart. The semen that belongs to the heart and the mind will certainly flow out. If an aspirant does only Japa and meditation, if he does not develop the heart, and if he does not practice physical exercise, he will have only mental Brahmacharya. The portion of the semen, which goes to nourish the heart and the body, will flow out. 

But an advanced Yogi who dives deep in meditation will have full Brahmacharya even if he does not take physical exercise. 

 
Semen is the quintessence of food or blood. One drop of semen in manufactured out of forty drops of blood according to modern medical science. According to Ayurveda, it is elaborated out of eighty drops of blood. The two testes or seeds that are located in the scrotal bag are called secretory glands. The cells of these testes have been endowed with the peculiar property of secreting semen from the blood. Just as bees collect honey in the honeycomb drop by drop, so also, the cells of the testes collect semen drop by drop from the blood. Then this fluid is taken by the two ducts or tubes to the vesiculae seminalis. Under excitement, it is thrown out by special ducts, called ejaculatory ducts, into the urethra where it is mixed with the prostatic juice.
 
Semen is found in a subtle state in all the cells of the body. Just as sugar is all-pervading in the sugar-cane, butter in milk, so also, semen is pervading the whole body. Just as the butter milk is thin after the butter is removed, so also, semen is thinned by its wastage. The more the wastage of semen the more is the weakness. 
 
In the Yoga Sastras it is said:
“Maranam Bindu Patanat, Jivanam Bindu Rakshanat”.  
Falling of semen brings death; preservation of semen gives life. 
Semen is the real vitality in men. It is the hidden treasure in man. It imparts Brahma-Tejas to the face and strength to the intellect. 
 
Mind, Prana and Veerya (sexual energy)
 
Mind, Prana and Veerya are the three links of one chain. They are the three pillars of the edifice of Jivatma. Destroy one pillar—mind, Prana or Veerya—and the whole building will fall to pieces.
 
Mind, Prana and Veerya are one. By controlling the mind, you can control Prana and semen. By controlling Prana you can control the mind and semen. By controlling semen, you can control the mind and Prana.
 
Mind, Prana and Veerya are under the one Sambandha or connection or circuit. If the mind is controlled, Prana and Veerya are controlled automatically. He who suspends or restrains Prana restrains also the working of the mind and the movement of the Veerya. Again, if the Veerya is controlled, and if it is made to flow upwards into the brain by pure thoughts and the practice of Viparita Karani Mudras such as Sarvangasana and Sirshasana and Pranayama, the mind and the Prana are automatically controlled. 
 
The mind is set in motion or rendered active by two things—the vibration of Prana and the Vasanas or subtle desires. Where the mind is absorbed, there the Prana is restrained; and where the Prana is fixed, there the mind also is absorbed. Mind and Prana are intimate companions, like a man and his shadow. If the mind and the Prana are not restrained, all the organs of sensation and action keep actively engaged in their respective functions.
 
When a man is excited by passion, the Prana is set in motion. Then the whole body obeys the dictate of the mind just as a soldier obeys the command of his commander. The vital air or Prana moves the internal sap or semen. The semen is put into motion. It falls downwards, just as the clouds burst into rain water, just as the fruits, flowers and leaves of the trees drop down by the force of the blowing winds.
 
If the Veerya is lost, Prana gets unsteady. Prana is agitated. The man becomes nervous. Then the mind also cannot work properly. The man becomes fickle-minded. There is mental weakness.
 
If the Prana is rendered steady, the mind also becomes steady. If the Veerya is steady, the mind also is steady. If the Veerya is steady, the mind also is steady. If the Drishti or vision is steady, the mind also becomes steady. Therefore, control the Prana, the Veerya and the Drishti.
 
God is Rasa. Raso Vai Sah. Rasa is Veerya, the vital fluid or semen. You can get eternal bliss by the attainment of Rasa or Veerya only. Rasohyevayam Labdhva Anandi Bhavati.
 

Grasp fully the importance and value of this vital essence of life. Veerya is all power. Veerya is all money. Veerya is God. Veerya is Sita. Veerya is Radha. Veerya is Durga. Veerya is God in motion. Veerya is dynamic Will. Veerya is Atma-Bal. Veerya is God’s Vibhuti.

The Lord says in the Gita: “Paurusham Nrishu. I am the seed or virility in men”.

Veerya is the essence of life, thought, intelligence and consciousness. Therefore, preserve this vital fluid very, very carefully, my dear readers!

NOTE:
Female  sexual energy: Although Swami Sivananda in his works speaks mostly about men and the transformation of semen to ojas, I would like to mention here that the same applies to women as well. The ojas in women is stored into the vaginal secretions, which are discarded by the orgasmic spasms. Sexual energy is most precious of all because our vitality, creativity and our mental and emotional strength depend on the quality and the vigor of sexual energy. Dr. David Frawley mention in his books about Ayurveda that the sexual tissues are also the containers of tejas and prana too.

How to use the power of celibacy for wealth gain:

 For a complete list about the benefits of Celibacy, you may read it HERE