I've done this myself, though accidentaly, a couple of times. Disqualified myself as a partner to girls who I lived with or who I knew were seeig someone. Told a group of girls I lived with at Uni as a joke 'sorry girls but one of my rules is not fück anyone I live with' the first night we all drank together. Fast forward a year I fûcked four of them. But overall I'm disappointed I broke my own rules, it caused great drama as I predicted haha