There really isn't any reason for a woman to get a boob-job unless something happens that they lose their own to surgery due to disease, accident and etc.
Jenna Haze is hot the way she is, and besides at least from what I've been told that smaller boobed babes tend to be better in the sack. Never had a chance to find that one out yet though.
Boob jobs can just lead to the fake plastic, alien look that happens when plastic surgery goes too far....just look at Rose McGowan...she was a babe....now whatever the F she did to her face is just awful. Jenna Jameson is another prime example of plastic surgery going to far...