It seems to me that we are all in the same boat if we are single,,you can go ages and ages and even more ages without even a thought,then something happens(usually beer induced) and whammo your with your ex,,,,sex with your ex is something but nothing in the end but considered acceptable for some reason, and you wonder why you just did it,because you feel the same about them after as you did before...mixture of weakness,beer and loneliness...Well thats what i think anyway,could be a load of bollox really ;-)