OPL2
Open source, moddable game engine for the "Polygon Love 2" game
... be used for many other things such as cosplay simulation.
Hongfire thread to talk about the game: http://www.hongfire.com/forum/showthread.php/410086-OPL2-open-source-and-moddable-3d-hentai-game/page27?highlight=opl2
(WARNING! EXPLICIT CONTENT!)