I think it's important to see why Marcus is valued. Is it because she is able to deactivate the torpedo, or is it because she looks nice? I think if you asked Jim Kirk that question, he would only come to appreciate her as a member of the crew after he valued how she looked. So she gets in the door, so to speak, because of her looks, not her credentials, and that is a sad commentary on the 23rd century.
In and of itself, attraction is not a bad thing. When girls get the message that this is the only thing that gives them worth, then I think the culture should examine itself. Now you can dispute that all you want, that girls get this message from television and movies. I understand it is not the only influence. But where does that peer pressure come from? What sets the trend for clothing? My guess is advertisements and wanting to look like a particular star. What sets the attitude of girls before they ever enter into middle school? This is trying to get to the root of that. But there is overwhelming scientific evidence, some presented in this thread, that girls respond differently than boys to these perfect images of their physique. A boy's worth is not tied to his physical appearance. The needs of girls are not the same as boys. They are not the same, I suggest not equating the two.
As I said, this is not the only place we need to do work. But Star Trek being a more progressive, inclusive universe, I don't expect a 2013 version of that universe to reflect Gene Roddenberry's sexism. This is supposed to be a hopeful future.
Context matters. And when Kirk is in bed with two women, it shows him as a womanizer. We are not shown why he is in bed with them, except that he flirts with every pretty face that walks by (the scene with Spock where they talk about the 5-year mission, the scene with Bones talking about the Kobiashi Maru). I don't think that is more than a pop culture representation of James Kirk. William Shatner's portrayal, and in the scripts themselves, was to learn about the people he was on the Enterprise with. He didn't have cheap hook-ups every time he went out into space. He listened to them. He fought with them. So even if this is keeping in the tradition of Kirk, this frat boy is not the James Kirk I remember.
Complaining is not limiting anyone's freedom. It is a discourse, loud and messy as this one has been, about what to do with this scene. It's about education of what is actually being discovered in science, and using that information. Do I think there needs to be new decency standards? In terms of financial penalties for showing a model that is sickly underweight, yes. This movie would not qualify. Do I think we need to ban Barbies? No, I think we need to create a public swell to make sure that the dolls change their shape. I am not asking for women to dress from head-to-toe and have fat dolls to play with. But I think we are putting them in a situation where media images, in combination with other factors, are causing pain.
Now as a man, I am insulted by these images. I am insulted that I am seen as some drooling frat boy that just wants to see naked women and get drunk all the time. My experience with this movie was that I laughed and muttered "completely useless scene." I wanted to walk out of the theater, and stopped myself, because I knew I would have to pay again to see the rest of it. When we see men's magazines, women are plastered all over them. It's as if I never have a thought that doesn't include naked women. I never want to know how about health or politics or comedy. Someone says "We cater to men," it automatically means beer, pizza, tv, sports, and women. It means I can't watch other popular science fiction without being offended. It means that I cannot watch a comedy about men without seeing those images (Hangover III) or having a stupid Dad that just goes along with whatever the wife says because she bitches a lot and he can't take her incessant whining. If that appeals to you, fine. It doesn't to me. And I avoid things that say "we cater to men" for that purpose. This movie caters to men.