What eww no. OP is right if they just realistically and MODESTLY make characters it should be easy to differ. It's not necessary to sexualize things to get the point across.

Sexualization is something that can't really be done. The men and women must be fully covered in armor otherwise they can't survive on Venus, on Pluto, actually on every planet except Earth, (Mars could be possible with oxigen masks, but the methane in the air would cause serious skin irritation in sheer seconds not to mention staggering tempature differences and various other lethal activities in the atmosfere) seeing as how there is a to low oxigen level (if any) on all other planets in our solar system. So we're going to be looking at fully covered humans. Awoken seem to been getting the sexy looks but that will be the case for as well male as female, (as far as a man can be sexy) and I doubt that Awoken don't have to breathe anything and can handle degrees like minus 200 degrees so there's a good chance they'll be covered up in armor as well. As for the Exo, I would find it very impressive of Bungie if they make a robot that looks legitimately sexy. By the way, aren't we going to be able to costumize are character completely? I which case I think you'll be able to decide yourself wether you want your male/female personage to look sexy.

Meh your forgetting that all these rules don't apply in video games. Anyway I hope your right. Nah I don't want to be some sexy beast. I'd much rather give an honest representation of myself, slightly underweight, tall, ect. Ill be a hunter because I always choose those stealthy classes. Oh and yes I'll be playing as a dude. I can't relate to female characters because I'm not one.