Ok so basically its a no go for serious relationships. Here is my problem i've done it lots time before but not really in a serious relationship and i do think its really hot and i like doing 3sum's. My girlfreind knows that i like them so she brought it up a few weeks back and asked me what i thought about it and asked if i had anyone in mind.oh and this is a Male-female -female. Being honest i told her how i felt and mentioned someone. Ok everything was kool before she left for NY and she's gonna be there for 3 weeks. The first few days everything was good until one night she called me crying and saying the only reason i wanted to have a 3sum was because i wanted to screw some other chick. Which wasnt true but it seems like one of her co-workers hammered it in her head that, that was the reason why i wanted to. So i dont even know she was the one who asked i just answered and being honest i told her the truth. But i guess it was a trick question.