Well, good?!?
Generally allowing adult content of sexual nature should be done. Those who have a problem with it but don't mind the often ultraviolent games are somewhat ridiculous.
Now, that doesn't mean that individual games (including this one perhaps) can't have questionable or downright illegal content that should get them banned (maybe even sued, depending on circumstances) and I don't doubt that many such porn games exist and a few will try to get on their.
In principle, though, I don't have a problem with this.
Mostly, anyway. One has to admit that games are already full of sexualization (or objectification) that one can easily deem 'damaging' to society in some aspects and porn is often just the worse in that regard. Would a potentially much broader, easy access to games that might be like that be an issue? Perhaps? On the other hand, half of the internet is already easily accessible porn anyway, so how much of an impact could this really have at large?