Sexuality, like all other things, should be included if it is in the devs vision and it helps to enhance the experience. All entertainment mediums at this point have rating systems to better inform consumers. It should be up to parents to police to their own children, and that should be that.

That is a very good question that I don't know the answer for. Sexuality here is no big deal at all, so maybe it's a US thing like archer said.

It's very much a US thing, we're basically polar opposites of Europe where sexuality is far more accepted, and violence not nearly as glorified.  The US thrives on introducing children to horrendous levels of violence as early as possible, and shunning the human body.

Yup, very clear here. Sexuality is everywhere. TV, magazines, online. And our prisons are emptier than ever. Only 4.200 inmates and 4.400 people that are waiting for a possible imprisonment and only 130 murders last year and we have nearly 17 milion people.

They will lose a part of their audience by adding nudity

Yeah, I'd say Europe handles this better, but we still are "shy" on that department.

So far GTAV has grossed 2.5 Billion+, so I don't think they care.  Nor should they.

In my experience, the people that are offended by sexuality in games are a rare breed. It probably is the ones protecting young children that worry. I do not have to see much sexuality in games because it is everywhere. If it is there then cool, but I doubt most grown adults are concerned with the issue. Apathy is really a big thing for people on a lot of social debates.

A compagny want the maximum of profits they can

They have it, and they shouldn't care one iota for shitty parents.  Not every game is for every person.  Ratings are on the games for a reason.  If parents neglect to utilize the tools they have in front of them, to properly oversee their childs upbringing, they probably should've thought longer and harder about having children in the first place.