Usually transgressive in both social and sexual areas, the Aquarius is a provocative, fantast and untiring sign. Its cerebrality brings him to accurately select experiences and fantasies, its trasgressiveness brings him to live them, its infidelity to live them with various persons. It is quite clear that fantasy and cerebrality are optimal ingredients in a BDSM play.
Pissing here drawed outline the trangressiveness of the sign.
For the Aquarius the typical erogenous areas are the back and the calves. Which may suggest ideas for interesting bondage :)