These are some pictures and a video from Sports Illustrated of Kate Upton modeling two $20 Target bikinis in nearly zero gravity aboard a vomit comet. I think we can all agree that, at least from a purely scientific standpoint, they provide significant insight about how big ol' boobies would react in space. *tapping lab goggles on monitor* It looks like they react really well.
Keep going for your fix of space boobs.
Thanks to Carmen, black&tan and PYY, who can all confirm sex in space is incredible.