Sexual coercion, if done in reality, is a horrible crime.
So is shooting someone, setting fire to houses, etc etc.
Games aren't reality, setting fire to a house in skyrim doesn't mean you've commit or are planning an arson and should be sent to prison.
I agree that somehow "rape in a game" feels different from "shooting someone in a game". Does it feel different because of the puritanical christian culture we've been brought up in, where cops murdering people with guns is normal and celebrated, but priests raping young boys is still mostly hidden? Is it because there's some fundamental difference between the two crimes? Is getting perverse sexual pleasure criminal, but having fun shooting people in grand theft auto is okay?
My opinion is that even though it feels different, it's fine. Consensual rape-play in the bedroom isn't my cup of tea, I won't do it, it gives me the ick, but people can do what they want. If those same people want to play rape games, well, it gives me the ick, but that's up to them, they and the game developers consent to this media existing, and it's fiction, just like rape-play in the bedroom is. The safe word is alt+f4
While I agree with you I do think that it should be noted that in the West rape happens a lot more often than shootings (even with the US throwing off the average) or arson. That being said, sexual assault isn't being brought up because of its prevalence but just for shock value.
If I recall correctly it has been proven that violent games do not affect young adults in negative way unless they are already mentally disturbed. There are thousands of movies that depict killing and sexual violence and nobody talks about it anymore. I think just like Gabe Newell said that videos games are more powerful medium than movies because they give you control over your character and you can shape the story how you like. That's what is bothering those "human rights" warriors. They are against games because they are such a powerful art tool.