Naked pictures - Keep for internet posting.
Rest - Toss, it doesn't help having a constant reminder, and by the time you can be nostalgic, most of it will be worthless anyways.
But thats me, I was never big on gift giving or gift getting, so its not like any relationships I was in gave me piles of stuff to deal with. In fact thats one of the issues I settled pretty quickly with the women I was with, and it always seemed to work out well.