To have sex with a person because of a feature they possess. You would probably not have sex with this person if they did not have this feature.

Possible Features:
Disfigurement (Missing a finger to Quadriplegic)
Size (Anorexic to Michelin Man)
Relation to someone (Celebrities cousin to an asshole high school band directors daughter)
Body Modifications (Tongue Ring to Gauged Anus)

Derived from "Squillionaire," "squill" is a dereogatory term for anyone who accumulates, flaunts, hoardes, or otherwise posseses wealth beyond reason.