Oral Sex
Fellatio is oral sex performed upon the human male penis. It may be performed to induce orgasm and ejaculation of semen or it can be used as foreplay prior to vaginal or anal forms of intercourse. Although the technique usually involves sucking, rather than blowing, the sex-act of fellatio (or, more precisely, fellating to the point of orgasm) is commonly referred to as a blowjob. Fellatio (but also cunnilingus) is sometimes referred to as "giving head".
It has been suggested that fellatio may, through "immune modulation", have a beneficial role in preventing dangerous complications during pregnancy. Specifically, several research groups have reported that preeclampsia, a life threatening complication that sometimes arises in pregnancy, is much less frequent in couples who have practiced oral sex, and even more rare in couples where fellatio regularly ended with a woman's swallowing of her partner's semen. The results were statistically significant and are consistent with the fact that semen contains several agents that have important roles in the prevention of preeclampsia, which may arise out of an immunological condition.
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