fellatio: erotic stimulation by sucking [from Latin, fellare] of the penis with the lips, mouth, tongue, and throat, by a partner of either sex, as a part of normal loveplay, and possibly inducing orgasm. stimulation of the penis by taking it into the mouth, possibly to the point of orgasm. The partner may be of either sex. Not a paraphlia, It is considered a normal part of love play.

Dictionary of Sexology Project: Main Index