Rival in locked room, he has sex with his gf, or one of the girls he as max hearts with. The other room you can rest, you can either discredit the rival or have sex with a girl you have already a special suite for. There is also one room the rival sits at a campfire with some girls and if pass through that room, you get a huge blow to yourself as rival will massive discredit you and girls will probably be easier for him to like him. I personaly cheat with those rooms, I save before entering a door with white light, as that only door that give extra room option and reload till get an extra room I like to improve my standing with girls, but if you like hardcore and don't care to lose girls to rival you just can play normal.