>>2642470When you really have a waifu, you are in love with her and it makes you no longer romantically interested in real woman. You still find them attractive, but if your relationship with your waifu is healthy, she should fulfill all your romantic and sexual desires so you don't feel any need to get real girlfriend. Also because you care about her and love her, you would never do any romantic or sexual activity with real woman just because you want to stay faithful and devoted to her.