I don't think sex in gaming needs to be a meaningful experience every time. In reality, many of us have been pretty casual with our own sexuality, and reflecting this in gaming as a possibility seems like a good idea too. My character in Fable 2 (one of them anyway) was a womanizer. If I showed up in town for a sale and it was a few ours before the shops were open I'd grab the local bar wench and have at her. Sure, there was nothing to see, but at least I had, to an extent, the option.
My take is that sex in games will and must evolve in order for gaming to survive. The core audience are adults, and just as cinema had to evolve with how it censored itself so must gaming. I remember back in the 80s when the song "I want your sex" was not being aired on American music stations for a short time because of their concern with the use of that word and the theme of the music. We've come a long way (I'm American, so I can really only observe things from my side).
Bare bodies were inevitable in film, as were depictions of sex. Gaming, as a medium of entertainment, has started to and eventually will get there as well. I loved Indigo Prophecy, it was a really fun and really exciting game that told a fascinating story (I love doomsday stories), and it not only had nudity, but it also had a few mini-games that allowed characters to interact sexually. I thought they were appropriate, and at least as well done as any R-rated movie may have portrayed it.
Maybe the archaic notion that gaming is for kids will vanish when those stubborn gray-headed politicians do?