"You could just... go and dally with Muggle girls," she points out. Distaste is evident in her voice, but it's certainly not unheard of. "I know for a fact that Henry Mulcuber brings them home every weekend, terrifies them with magic, then Obliviates them."

He also does all sorts of other things with those girls before he panics them by casting ridiculous spells, but Narcissa isn't going to mention those.