A few years ago I was dating a woman with natural 34 triple D's who let me fuck her tits on our second date because she was having her period. She admitted she really didn't get to big a charge of tit fucking for the obvious reasons, but liked it with me because I was big too. We did it a lot after that, but only as a buildup to the main program.
That said, I'm a guy who likes significant waist-hip definition, and the boobs can be whatever if the woman is attractive and has a great ass.