Fellatio also known as fellation and in slang as blowjobBJgiving heador sucking off  is an oral sex act involving the use of the mouth or throatwhich is usually performed by a person on the penis of another person.
If performed on oneself, the act is called autofellatio.
Fellatio can be sexually arousing for both participants, and may lead to orgasm for the receiving partner. 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 that ban the practice of oral sex, though some cultures may consider it taboo.
In fellatio the Man to man fellatio is replaced by the -io ; the declension stem ends in -ion-which gives the suffix the form -ion cf.
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. Further English words have been created based on the same Latin root. Man to man fellatio person who performs fellatio upon another may be termed a fellator ; because of Latin's gender based declensionthis word may be restricted by some English speakers to describing a male.
The equivalent term for a female is fellatrix. A person who performs fellatio on someone may be referred to as the giving partner, and the other person as the receiving partner. Fellatio can be sexually arousing for participants, and males commonly experience orgasm and ejaculation of semen during the act. When the penis is thrust into someone's mouth, it may be called irrumatiothough the term is rarely used.
The essential aspect of fellatio is for a man's sex partner to take his penis into their mouth, and then move their mouth up and down the penis to a rhythm set by them mimicking the thrusting motion of vaginal or anal intercourse, with saliva acting as a lubricant, and being careful not to bite or scratch with the teeth. The man's partner Man to man fellatio also orally play with his penis by licking, sucking, kissing or otherwise playing with the tongue and lips.
It is difficult for some people to perform fellatio, due to their sensitivities to the natural gag reflex. Different people have different sensitivities to the reflex, but some people learn to suppress the reflex. Deep-throating is an act in which a Man to man fellatio partner takes the entire erect penis deep into their mouth, in such a way as to enter their throat. The Triumph of Love over Rage, suggests that swallowing semen is high on a man's intimacy scale.
Giving and receiving fellatio may happen simultaneously in sex positions like 69 and daisy chain. Fellatio is sometimes practiced when penile penetration would create a physical difficulty for a sex partner.
For example, it may be practiced during pregnancy instead of vaginal intercourse by couples wishing to engage in intimate sexual activity while avoiding the Man to man fellatio of vaginal intercourse during later stages of pregnancy. It is physically possible for men who have sufficient flexibility, penis size or a combination of the two to perform fellatio by oneself as a form of masturbation ; this is called autofellatio.
Few men possess sufficient flexibility and penis length to safely perform the necessary frontbend. It may be that "few women praise the taste" of semen. Risk of STI infection, however, is generally considered Man to man fellatio lower for oral sex than for vaginal or anal sex, with HIV transmission considered the lowest risk with regard to oral sex. There is an increased risk of STI transmission if the receiving partner has wounds on his genitals, or if the giving partner has wounds or open sores on or in his or her mouth, or bleeding gums.
Because of the aforementioned factors, medical sources advise the use of condoms or other effective barrier methods when performing or receiving fellatio with a partner whose STI status is unknown.
Links have been reported between oral sex and oral cancer with human papillomavirus HPV -infected people. The study found that 36 percent of the cancer patients had HPV compared to only 1 percent of the healthy control group.
A study suggested a correlation between oral sex and throat cancer.
It is believed that this is due to the transmission of HPV, a virus that has been implicated in the majority of cervical cancers and which has been detected in throat cancer tissue in numerous studies. The study concludes that people who had one to five oral sex partners in their lifetime had approximately a doubled risk Man to man fellatio throat cancer compared with those who never engaged in this activity and those with more than five oral sex partners had a percent increased risk.
Fellatio cannot result in pregnancyas there is no way for ingested sperm to reach the uterus and fallopian tubes to fertilize an egg. At any rate, acids in the stomach and digestive enzymes in the digestive tract break down and kill spermatozoa.
Clinical research has tentatively linked fellatio with immune modulation,  indicating it may reduce the chance of complications during pregnancy.
The potentially fatal complication pre-eclampsia was observed to occur less in women who regularly engaged in fellatio, with those who also ingested their partner's semen being at the least risk. As late assome doctors were advising women in the eighth and ninth months of pregnancy not to swallow semen lest it induce premature labor,  though it is now known to be safe.