The H-scene with the Goblin Shopkeeper is easily the funniest scene in the entire game. And it's the only one that has an actual reward for doing it, cause you get a discount at the goblin's store after you have kinky roleplay sex with him.
For anyone who hasn't seen this scene yet, go back to the goblin village after you beat the fairy prince and return from the fairy realm. There will be posters of you with hearts drawn on them up on the shop walls, and the goblin shopkeeper will pretty much throw himself at you and beg for you to ravish him. You won't go for it the first time, so he'll reel his desires in and let you see the other wares he has for sale, but if you talk to him a second time you can choose either shop stuff or sex stuff.
It's the one opportunity in the game for the hero to have his revenge and make the goblin take it instead (and he's very vocal about how much he wants to hahaha).