Fellatio is oral sex performed on the penis. The word "fellatio" is a derivative of a Latin word denoting "to suck". In the modern slang it is usually known as a blowjob. Both males and females can perform fellatio that is regarded as an exceedingly intimate and gratifying activity for those who are involved in it.
It is unknown who, when and where introduced fellatio. Nevertheless, it is known to have been widely performed in Ancient India, Egypt, Greece and other ancient cultures. For example, Kama Sutra features fellatio and gives a detailed guidance on how to perform it.
At present, as well as in the past, fellatio is practised to boost sexual sensations and bring a man to an explosive orgasm. It is performed during foreplay prior to vaginal or anal penetration or as a part of oral sex.
Fellatio can be divided into 4 types. A traditional fellatio is observed when the giver is active and the receiver is passive. The second form of fellatio is when the person performing it is inactive and the person receiving it is active, thrusting while penetrating the sexual partner's mouth. The third kind is called auto-fellatio in which a man is is capable of performing "blowjob" on his own penis. And the fourth form is a deepthroat fellatio. It was named after a 1972 pornographic film which concentrates on it. This method includes taking the whole sexually stimulated penis in the mouth with the shaft bending a little to allow the head of the penis to glide partly down the giver's throat. Special practice is compulsory to avoid gagging. A detailed guidance on how perform a deepthroat fellatio properly can be found at deepthroathowto.com.
The stimulation can produce an orgasm and ejaculation of semen which may or may not be swallowed, according to individual preferences. It should be noted that intense sexual stimulation of the penis will make the organ produce a small amount of fluid before ejaculation. This fluid is ejaculated by the Cowper's glands and is not semen. Its purpose is to clean the urethra before ejaculation and to lubricate the foreskin during foreplay and penetration.
Some males regard the reception of fellatio as a form of dominance over their partners, which boosts their ego. Besides, when the giver swallows the receiver's ejaculated semen, some males subconsciously believe that their partner accepts them.