The difference being that guys worry about their penis size that a small dick might be the reason for unsatisfying sex for the lady ; some girls worry that smaller boobs affect the likelihood of the guy
wanting to sleep with them in the first place. I can't really speak for the other guys, but there are many things that make a woman "sexy" and a pair of tits, indeed many physical attributes, only go so far. I'd suggest that while lots of men have their buttons pushed by a big rack (and especially in porn circles there are plenty that jerk off to predominantly huge tits), in a real life situation it's insane if a guy will only find a woman sexy if she has large breasts.
Personally for example, I must admit my own porn tastes tilt towards the bigger chest, but in reality the woman that sparked the strongest sexual urges in me only needed a 34A bra. But she was
sexy, she is confident, carries herself with a knowledge that she is hot but never acts trashy, has that sparkle in her eye. Having a boo-tay to envy helps too.
Point is, a girl doesn't have a *whole* lot to worry about when things kick off, the guy has decided he would like to have sex with her, and barring coitus interruptus it is virtually guaranteed that he'll get off. Guys worry about their cock size because once things begin, after he has actually found a woman willing to sleep with him (which for some of us feels like we've won the lottery on Christmas Day and it's started raining beer all rolled into one), a whole fresh minefield begins with "am I going to be able to satisfy her with this?"
But yeah, as discussed, I'm not well endowed but once I started sleeping with girls I found that if the desire is strong enough that you've reached that stage already, things go well.
And yeah, chow down. Lavish love on the kitty.