This read like a troll post but I'm responding because I want to take the opportunity to talk about this point, from an adult game design perspective.
Naturally, I disagree. Of course, everyone swings differently, however, what I'm looking for in an adult game is not a representation of real sex. Real life sex can be a fun and intimate experience but in my opinion that is entirely different from what I get or want from an adult game. Adult games should be about sexual fantasy, and fantasies are impossible by definition.
It's like asking if you need to have had sex with a real horse in order to do a bestiality game. Surely not. (I just noticed Rafster made the same point but I'll make it again.) All you need to understand is the fantasy, because that is what you're recreating.
Similarly, I've never owned any brothels or sex slaves myself, yet here I am making a game about both. Weird, huh!