This is where the OP does have a responsibility. Married people should be off limtis. Very few of the OP are in a marriage - some of them are, but many are unstable, and cruising. I know that my h's OW was. Yes, our spouses didn't have to go for it, but since being on my own I have seen so many times when I could have smiled, encouraged, and initiated an affair.

We are all vulnerable. We should all cherish our marriages. But we don't. I also think that many MLCers are looking for adventure more pursposefully than most. So I DO think that the OM/OW has responsibility as well as our spouses.