Well, I think a videogame lends itself better for sex or sex related scenes that a pnp RPG. I can imagine how, heh, unimaginably uncomfortable it would be to GM that kind of situation and tell the players what their sex partner is doing and how it feels XD.
Depends on the GMs mentality, personality and confidence and that of the group.
Dragon raised an interesting point: Technology opening avenues to new forms of sexual preferences. I'm tired of seeing ads on tv for "uniform dating" sites, but with the advent of the cybernetic revolution it stands to reaso n that some people would find themselves hopelessly attracted to full borgs.
Also, as Dragon pointed out, there would probably be new standards for what is and isn't seen as 'deviant' behaviour or taboo subjects.
These areas interest me quite a bit from a sociological point of view.