I'm married, have been for 10 years... but I have cheated on my wife from day one. I can't help it. It's not that I don't care about her, I do love her a lot and she's a great human beng, but the one person I've ever been truly in love with is my older sister. We can't explain our connection, we just gave in to our attraction when I was 15 and she was 20 (we're now 20 years older) and have had a secret affair ever since. She's married too, but she's also really in love with me. We started seeing other people to distract from suspicions about us, and it got out of hand. From what I have read here some people went for it and are actually fulfilled in successful, forbidden relationships. But we can't risk it. We don't want to hurt our respective spouses, which is another reason we fear being caught. But we can't help what we feel for each other, it's a love and a sexual chemistry too strong to explain. Making love to each other is the closest thing we know to true, nirvana-like ecstasy. No other romantic or sexual partner has ever compared.