What should you say when your beau asks how many men you've slept with? "Sexual history questions are a trap," says Mira Kirshenbaum, author of I Love You But I Don't Trust You. "Just say, 'I don't to go into that. My life is with you now.' Details will just open doors that lead to bad places." Where you should be forthright and open is when an ex makes contact with you, even if it's a harmless email. "Always disclose this. Keeping it hidden is what gives it a heap of meaning," says Kirshenbaum.