Just to check. Are these the three arguments?
1: Portraying female video game character's bodies as unrealistically sexy is bad because women some times lose out on jobs because they don't look enough like Lara Croft. Also, nothing like this happens to men.
2: Portraying female video game characters as *only* unrealistically sexy is obviously bad because... it's unfair? Guys are empowered by tubby male characters in video games?
3: Portraying female video game character's bodies as unrealistically sexy is bad because heterosexual guys get off on it, and games are made for heterosexual guys. Portraying *male* video game character's bodies as unrealistically sexy is unproblematic because guys don't get off on it.
Provided I've understood his arguments, here's what I think:
1: I would like to see a source for that. I googled around a bit and couldn't find any clear study showing that this is a bigger problem for women than for men. It's different, sure. Women face discrimination based on weight, while men face it based on height. I also don't see a link between video games and this kind of discrimination.
2: I don't really feel like disagreeing with this. Actually, I'd love to see more body types in video games.
3: I would say that both are problematic, for reasons that have more to do with expectations and body image -- for the person playing the games, and their views on others. In and of itself, don't see anything wrong with getting off on characters in video games.