Those thick booty, sexy chicks are the proverbial cheeseburger short of ballooning. You know the moment they get a little older, or stop working out, it's game over. But as Parlay stated, the skinny ones don't stay that way once they stop giving a fuck. I think we had one of those "before and after" threads running not that long ago, and it was linked to a site that had pics of girls when they were thin, and after pics of what they'd become. You wouldn't have thought it possible for some of them - it's like they tripled in size. After kids and/or complacency, they all balloon up. Thin, athletic chicks that actually like working to stay in shape are a decent risk for LTR/marriage, but NO woman that doesn't try to stay fit and control her diet will eventually gain a lot of weight. Thicker chicks have a head start, but the others catch up.
"The best kind of pride is that which compels a man to do his best when no one is watching."