Nudity and overt sexuality in a Divinity game would be silly; it would contradict the established tone of Rivellon. I don't expect to see it, I wouldn't expect to see it and I'm pretty certain I won't see it in the finished game.
It's kind of a silly topic to discuss, since one thing Larian has always been very consistent on is the tone of their games, which have always been very whimsical and hardly "grim," "gritty" or adult-themed.