I read comics and I'm married- so I have this conversation with my wife all of the time.
Here's a typical conversation we have:
She: Why do the women have to be practically naked?
Me: They're not all practically naked. Look, this one is covered head to toe!
She: Yes, but everything she is wearing is skin tight! She might as well be naked.
Me: The men are wearing just as much skin tight clothing as the women.
She: But it's different. All of the women have huge boobs-
Me: And all of the men have a 12 pack and massive biceps on their biceps.
She: But it's not the same- because breasts are "sexual" and the biceps aren't.
Me: The biceps are just as 'sexually attractive' as the breasts.
She: ... (Yes, she's an anime character.)
Me: Okay, maybe not "just as" sexually attractive- put it's part of it!
Having had this conversation about 10 times a year, I have had some refined thoughts on it. They go like this:
Our sexual instincts are designed to ensure survival of the species. Men are attracted to women so that the species can survive. Women are attracted to men so that the species can survive. (And then there's Rob, but that's another subject) In this way, men and women are the same. However, a man's role in the survival is different than a woman's. Obviously we have physical differences. Traditionally- men have been providers of physical needs and protection and women have been bares of the babies, providers of emotional nourishment and washers of the dishes. ;) In our post-modern world, I have heard of women that earn the money and men that wash the dishes- but that's not what our natural instincts are tuned towards.
So, to mid-cap- women are sexually attracted to men who appear to be good physical providers and men are sexually attracted to women who appear to be capable of taking care of babies. Are we all on the same page?
So, a healthy and fertile looking female is sexually attractive to us. on the most basic level. Obviously not everyone will agree on which females are the most healthy and fertile looking, but most of us men share the basic concept (hint: it's boobs)- and not a lot has changed over the years.
Women, however, seem to be very confused when presented with the current situation. Their most primal of primal instincts tells them that a very strong and muscley man will be best at hunting wild game and protecting her and their children from danger. However, most of us don't hunt game to put food on the table and our modern society makes physical danger a lot less likely than it used to be. So, how now to judge which male is best capable of furthering the species with her? Well, I think the first thing a lot of women look for is a guy that will stick around and be a father to the children- that's probably always been the case. But how will the father provide? Meaning- what is his potential to earn money? Is he smart or funny or hard working, etc? That will earn him money. Or- how much money does he already have? Surely, that is some clue as to how good of a provider he will be.
Now those thugs with lots of money hanging out with beautiful women makes all sorts of sense.
Women are torn between their primal instincts and their modern understanding of what it means to be a provider. This confusion is good for us guys because they might be so confused that they end up with us: A guy who is neither muscley or rich!
In conclusion, a womans perceived fertility (again: boobs) are the prime source of their "sexual attractiveness" to a man and a man's variety of qualities that a woman may or may not correctly attribute to his ability to provide are those that make him sexually attractive to a woman.
So, in an action movie- a man shooting guns and otherwise being an action hero is on par as a foxy lady getting some foxy foxy screen time in terms of how they are being portrayed as the epitome of sexual attaction to the oppoiste sex.