Hey guys,
A lot of interesting comments. Just to slightly flip the script, I wasn't writing this about my girlfriend. In fact, I don't have a girlfriend currently. My closest friends are girls, though, and on different ocassions all of them have slept over in my bed. I know, and am friends with, all their boyfriends, and I wouldn't mess that up.
Are you crazy? Why on earth would you let your friend's girlfriend sleep in the same bed as you? Do you want an a$$ kicking or are you just plain dumb? You tell her "Sorry, I don't think it would be appropriate for us to sleep in the same bed since you are my best friend's girlfriend."
I have a nice condo in the middle of the party district, so my place is very often the meeting spot, and afterhours party. However, as the saying goes, location location location...I could only afford a studio, and thus have no room for a couch, or any other adequate sleeping arrangements. Yes, they can sleep on the hard wood floor if they wanted to, but come on. I kinda felt as though one of them may have wanted to do something, but I had my barriers up, and besides, I could have been wrong...alcohol impairs judgement. In all cases, they stayed over because I drank too much to drive them home, and sending a girl off by herself at 3:00am in the party district is not exactly a safe move. The boyfriends were either out of town or just not answering their phone; hell, it's 3:00am.
You could:
1) Make the sleeping arrangements beforehand
2) Not drink so much
3) Have her not drink so much
4) Have a friend pick her up
5) Have a taxi pick her up
6) etc
I was just thinking about how I'd feel if I were in the guy's shoes. I find it interesting that more than a couple of you would say to dump her for doing what she did, when in reality there was no wrong done.