What if a married coworker invites you to spend the night with him after you both have been drinking?

It doesn't mean you have to spend the night. And what difference does it make if your drinking,does that justify giving yourself permission to do so because of it? No. Drinking or not drinking you will make a choice. Sounds to me as if you had already made your choice before you ask the question. Also if your drinking, does that mean because he is married it would be a excuse to make out like you didn't know what you where doing and it JUST HAPPEN? Go figure