Fellates

Fellatio (also known as fellation, and colloquially as blowjob, BJ, giving head, or sucking off) is an oral sex act involving the use of the mouth or throat, which is performed by a person on the penis of another person or oneself (autofellatio). Oral stimulation of the scrotum may also be termed fellatio or tea bagging.

Fellatio can be sexually arousing for both participants, and may lead to orgasm for the receptive partner. It may be performed by a sexual partner as foreplay before other sexual activities (such as vaginal or anal intercourse), or as an erotic and physically intimate act in its own right. Like most forms of sexual activity, oral sex creates a risk of contracting sexually transmitted infections (STIs/STDs). However, the transmission risk for oral sex, especially HIV transmission, is significantly lower than for vaginal or anal sex.

Most countries do not have laws which ban the practice of oral sex, though some cultures may consider it taboo. People may also have negative feelings or sexual inhibitions about giving or receiving oral sex; they may refuse to engage in it of their own volition. Commonly, people do not regard forms of oral sex as affecting the virginity of either partner, though opinions on the matter vary.

The English noun fellatio comes from fellātus, which in Latin is the past participle of the verb fellāre, meaning to suck. In fellatio the -us is replaced by the -io; the declension stem ends in -ion-, which gives the suffix the form -ion (cf. French fellation). The -io(n) ending is used in English to create nouns from Latin adjectives and it can indicate a state or action wherein the Latin verb is being, or has been, performed.

...
Wikipedia