It's not. An RPG starts with making a character, that's what roleplaying is. I'm not an actor, i don't want to play someone else's character, especially not a basic dude that's obviously designed for insecure teenage boys. If the character is preestablished, it's not and RPG, it's a linear adventure game, and if there are choices, you are just telling said preestablished character what to do. Even if character creation wasn't important, more than half of the human population won't be able to get into the skin of a male protagonist (especially in a porn game). Dev who makes an "RPG" with only a male character is making the game for men only, plus, not all men want to play as a guy character, and i'm not talking about the ones that play as a woman to "look at their character's ass". Making your game for men only, screams from the start that the dev doesn't care about giving players options, and options is the point of RPGs.