If we're talking about those weird porn games floating round the internet, then I see no problem with them. It's just another thing to base a fictional work on. Doesn't make it wrong or immoral, just based on something that isn't touched upon much when it comes to video games.
It is fun, competative, and it is good exersize. If sex was made into an olyimpic sport then I would practice very hard so I could represent my country and my team in Los Angeles in 2022. Imagine all the sponsorship the teams could have. It would be really awesome.