As for impressing girls ..... most of the girls I knew in high school seemed to prefer efemanite prettyboys (today I'd call them metrosexuals). In fact, a number of them felt compelled to point out to me that big muscles were gross.
Something to keep in mind is that the kind of thigns a woman is atracted to are different depending on where they are in their cycle. When they're ovulating and estrogen levels are peaking, masculine men are when they want. When a woman is on her period, that's when she likes the pretty boys.
How MUCH of a variance there is, I can't say, but it is there.
That being said, I am one of the pretty boys. I got my ass handed to me pretty much all of middle and high school. And if I had a choice between atractive women, and not getting my ass kicked. Guess which I'd choose.