The men being extra careful while a beautiful lady comes across is totally true. It's more of an effort to make a good first impression. You know, "First impression is the last impression", I don't agree with it though.
Nowadays, I've seen some girls prefering someone who's loud, manner less and cracks lame under the belt jokes. Can't really say anything on that as it's completely ridiculous. Such behavior is now motivated and that always leads us to bitter consequences.