Weird sex references have always existed in the background of video games, but they've become especially prevalent in the last 20 years. As game technology has caught up with Hollywood, creators are increasingly able to dish out seemingly endless fantasy worlds to delight thirsty players.
Developers can now render sex scenes in much greater detail, and even design some scenes to allow player participation. A few studios have managed to push the envelope by delivering some truly raunchy cut-scenes and mini-games for their fans to enjoy.
The uptick in polygonal sexuality has resulted in quite a few video game characters who are total pervs. Just look at Geralt of Rivia from The Witcher series; the monster hunter gets to sleep with quite a few women, and loves collecting mementos from all of his wild nights in bed (or on the back of a unicorn).
Then there are the more predatory protagonists, such as Tim from Braid and James Sunderland from Silent Hill 2. These sexually deviant perverts' desires run much darker than simply wanting to live happily ever after at the end of the game.