There's just one very quick scene which is "filmed" in such a way as to merely imply what's happening. i.e. it isn't even remotely explicit - you don't even see the front of her skirt IIRC...
-Kallen, hotter -Overly buxom usually better, as in this case -Looks litter more like Sakura than Nina looks like your stereotypical "anime girl with glasses"
also... -NINA'S A TABLE HUMPERRRRRRRRRRRRRRRRRR!!!