Earlier quoted context omitted.
I think the difference between acceptance of violent and sexual depictions in media is based on how likely it is to affect people's lives. Almost nobody has a natural tendency to act on violent thoughts, so playing a violent video game is unlikely to cause issues in real life. Most people will have sexual encounters at some point in their life though, so getting an unrealistic expectation of them can cause serious is…
If you think violent depictions in media won't make people more violent then how can you then think that sexual depictions make people more sexual or not? People don't have violent encounters in life (or any even that could escalate into violence)? Really? Seems like you're making the OP's point, something is special about sex in your mind.
For example, the last time I was in a real physical fight was in kindergarten. If I watch/play violent media, it can't affect the way I fight because I do not fight. Sex is something I might actually do though, so overexposure to twisted versions of it could actually color my real world experience.
I still tend to think that most healthy adult minds can easily make the distinction between reality and pretend though.