1) It was all part of an elaborate "punking."

2) Although Ashton was aware Demi was 16 years older than him, he didn't realize that she'd one day be 50 while he was still in his early 30s.

3) He figured that since he was taking over Charlie Sheen's role, it was okay for him to really take over Charlie's role.

4) Ashton is a firm believer in the "it's not cheating if you're in a different zip code" rule.

5) He was trying to help promote Demi's film Five, because there's no better way to promote a Lifetime movie than with a little marital infidelity.

6) Ashton is a people pleaser, so when a woman says "do me" he has no option but to comply.

7) He misunderstood what "separated" means. He thought that it was okay as long as Demi wasn't immediately nearby.