It could be because it removes a lot of the tension. At first I didn't know she was married so the sexual tension was there. It wasn't a bad interaction, we both enjoyed it. What I really meant was she didn't want to lead me on. Just before she got off at her stop (before mine) she did make eye contact again briefly.

Probably the hottest make out I've had was with a woman I met in a club. Then she said "sorry, I should tell you I'm married". Alcohol did play a part obviously in her going that far.