Guys and girls brains are wired differently. Guys are very visual and are quickly turned on by what they see. This explains why fetishes are much more common with guys.
A good quote I once heard explains another reason, "Women need a reason to have sex, guys just need a place." This is true and is a factor. Girls are turned on with their imaginations. Just look at sales of books with erotic scenes.
Women need more time to become aroused. Two guys who want to have sex don't need any foreplay. They can go straight to the ****** very quickly.
These are all generalizations and don't explain all people or their desires or how they become aroused. As an example, some girls have fetishes.
People's likes and desires and such are spread along a continuum. The average guy may be more visual than the average woman, but that means that some women will be more visual than the average guy and some guys will be less visual than the average woman, and so on.
As for two guys making out, well I've seen some gay **** guy-on-guy stuff that I have found hot because there were two really physically attractive guys and they were doing to each other oral stuff that we would usually be doing to our men and damn that was hot. So it all depends.
Like you, I am baffled by why so many women do seem to fall for "bad boy" types who are really ********... but then, why are so many guys ruled by their small head rather than their big head when some large breasted chick lets them look down her blouse?
Yes, exactly, that does keep life interesting. (By the way, when I said I have enjoyed guy-on-guy ****, that only is scenes of making out and having oral sex -- once they get into anal, I have no interest in seeing any more.)