Thanks for the answers all. Just to be clear about the situation, when I said walk away the next morning in THIS case (strangers are much different) I didn't mean forever I had planned on calling her again, but didn't see the need to right away or wake up cuddling the next morning or something like that. What's really odd is she does this ALOT (its become kind of a running joke around the circle), she seems to just love hooking up and getting some, which is great, but she's always complaining that the guys she picks up won't leave the next morning and keep calling her. I really figured she just wouldn't care.
I do appreciate all the advice and opinions and thank you for taking the time to offer it. I would love to hear more about what all of you think about the practice in general and the rules involved I think it would make for a great discussion. For example if you had a one night stand tonight how would you handle it? Would you feel obligated to stay overnight, call the next day? I don't think their is a proper answer but the opinions might interesting.
Plan 9: I have NO idea what issue it was I found it on the nightstand...it had a gun on the cover and maybe a red background...I didn't get much reading done that night though