Autofellatio is the act of oral stimulation of one's own penis as a form of masturbation. It is physically possible for men who have sufficient flexibility, penis size or a combination of the two to perform autofellatio.[1] Autofellatio is a niche in pornography.[2][3][4] It has also been observed, simultaneously with manual masturbation, among Cape ground squirrels.[5]

So it is.