Autofellatio is the act of oral stimulation of one's own penis as a form of masturbation. While few human males are sufficiently well-endowed and/or flexible enough to perform the frontbend required, increased flexibility achieved via gravity-assisted positions, and physical training such as gymnastics, contortion or yoga may make it possible for some. Fewer than 1% of men can successfully suck or lick their own penises.
David: I pleased myself last night by means of autofellatio.
Sean: Gay...
