I get that most shows hire  p o r n  stars for the very reason you stated. I just think that a little extra effort by the Casting Director would be in order to "keep it real" by not hiring chicks with the biggest  t i t s  and go more for a natural look. It just stands out too much. All the girls that I've seen within the fleet look like real women. Sure, there are bound to be a few that have gotten boob jobs and whatnot, but we just can't see anything because of the Military Uni's they wear. Same goes fro Game of Thrones. Sh*t man, some of the women they have portraying that 'era' in history, they could give the airbrushed, Photoshop women of today a run for their money. So when they get naked, it just doesn't match up well with what we have seen within the rest of their respective universes.