Why do women sleep with their best friends husband?

Answer 1

Because they are "introduced" by you for one thing, which makes everything alright. She's thinking that he must be safe as far as guys go because you like him. It's harder to meet somebody from scratch. There's tension and accountability. You break the ice for him and send him into a relaxed mode right away because there's nothing to prove, and at the very beginning there will probably be no getting together. Your friend picks up on that and it's all down hill from there. The first thing your girlfriend sees is this guys smile and so forth. In short, it's the convenience of not having to look around for a date. You need to find someone who's into you only, and you can trust that.