|"Bock" photography by Toby Atlass|
The definition of a power bottom is, according to the Urban Dictionary: Gay Male Term. Dominant Bottom. While a bottom is usually submissive to his partner, a power bottom enjoys maintaining control over the top and/or the penetration, the normally dominant role in gay male sex.
I actually think of myself as one of a select few truly versatile, but I had to find a picture for the post and at least this way no one will get upset.