Where to put your hands, how to use your tongue, and other advice. Whatever you call it—a blow job, fellatio, giving head, or going down—it doesn't require a PhD in anatomy to comprehend why having oral sex with someone who has a penis might feel amazing. When combined with the sounds and visuals of the act, the warm and wet feeling of a mouth on a penis' nerve-rich shaft and head can be insanely pleasurable. Receiving a beating is satisfying, but giving a head can also be rewarding.