Is mass effect 2 sexual?

I haven't played it in years on my old crappy pc but my litle cousin is coming around in a week and I remember the second mass effect was good and people praise it like hell but when I looked it up again I read alot of things of it being quite sexual....... Can somebody just tell me if the game REQUIRES you to be sexual and are there lots of charaters that like to show a bit more if there skin ;)