Make Prostitution a misc skill in game like dying. Please read well thought out,
Welcome to Project: Gorgon!
Project: Gorgon is a 3D fantasy MMORPG (massively-multiplayer online role-playing game) that features an immersive experience that allows the player to forge their own path through exploration and discovery. We won't be guiding you through a world on rails, and as a result there are many hidden secrets awaiting discovery. Project: Gorgon also features an ambitious skill based leveling system that bucks the current trend of pre-determined classes, thus allowing the player to combine skills in order to create a truly unique playing experience.
The Project: Gorgon development team is led by industry veteran Eric Heimburg. Eric has over a decade of experience working as a Senior and Lead Engineer, Developer, Designer and Producer on successful games such as Asheron’s Call 1 and 2, Star Trek Online and other successful Massively Multiplayer Online Games.
Call it romance instead of prostitution don't imply it as graphic sex but more pg-13 and have it be bartering skill or seduction skill as I mentioned above.
Not really for or against this, just thinking it through on a game mechanics standpoint. You could introduce dynamics like jealousy (losing favor with some as the cost of gaining favor with others) and your reputation itself could gain/lose you standing. I remember scaring an NPC as a spider, if you make advances at the wrong person it could backfire. I could see a human as they level up in the skill being warned about their actions to being completely shunned like some NPCs treat you if you have a beast curse.