Only borderline??!
I mean, what kind of mother does this with her 10-12 y.o. son?
As I said, a part of me is totally disgusted by what is happening, and I certainly don't condone anything like this ... I don't need to, to play this game. I've killed dozens of civilians and cops in GTA for money, or simply for fun. That doesn't make me a murderer.
George R. R. Martin came up with something unthinkable - a father (Craster) rapes her daughters, and gets more daughters in the process and rapes them too. And I think half of the world had fun watching such a show. Does that mean, all of them condone that? No... Jaime Lannister has sex with her sister, and many viewers/readers admire him.
And pedophilia is nothing new in art/literature... You could have a look at "Lolita" by Vladimir Nabokov - which basically shows a crooked and disturbing story involving a 12 y.o. girl from a pedophile's perspective - and yet it's considered one of the best novels in English literature.
Now, the only difference is that adult game is a graphic/visual media. So, should we apply different rules to it? That's an open-ended question.