It depends how secure our relationship is. If i felt that she loved me and only loved me i may be into something like that. Actually this has happened, long story short is this..... Basically I was dating this girl that at the time was way to hot for me but for some reason she really loved me, well after the fuzz wore off I wanted to get my best bud in on the action because it was just "that good" I always asked him to get in on it right infront of her and she would go along with it but neither of them thought I was serious so nothing ever came about it. Well about 4 months later she hooked up with another friend of mines girl which was pretty cool. If I had any thoughts that the girl I was with was looking for better I would not be into something like this because I am kinda insecure.