Two girls and one guy???....

I always had one principle in sexual relations - to have sex with anybody i should love him... And still i think this way. As far as i also think that it's possible to LOVE just one person in one moment (it doesn't matter it can be the period of one hour or one year or the whole life - u can name it as LOVE), so I never could afford myself to have sex with two guys at the same time. But i wanna tell the story which happened to me couple years ago when I was single and was a student.
I had a friend (a girl) who I knew rather well. Once I came to her in the evening and thought to stay at her for a night. So we had good mood and wanted to have fun. We were thinking about where to go and with who. So it happened that her friend (a guy, actually her lover) was in a company with us alone. So we went out together good way, smoked some pots and were laughing until our stomach was aching. So we came to her house rather late around 2-3 pm, we drank couple cocktails or something like this and i felt very sleepy and couldn't wait for his leaving to go to bed. What's my surprise when i knew that he stays and i'll have to share one bed with my girlfriend (it's ok) and him (it's shock for me). So being a student i didn't have money to spend them on a taxi (in a case if u don't like something u'r free to leave) and it's too late that public transport was not working. So i had to stay.
So laying together i was trying to fall asleep but they started to make love. I got up and went to the kitchen. I was sitting there, smoking, and feeling so awful, when they call me and invited me to join them. It's was the second shock time at that evening. I understand the position of a guy in that case, but didn't expect that from my girlfriend. So i said no (even being drunk I had some stop signs inside me), but they felt very relaxed and were having sex just in front of me! One moment i thought about to join them just to have experience but I couldn't. I felt disgusted. I was remembering the scene from porno movies which exited me back then and couldn't believe that it's so disgusted in real life especially if u'r witness of this. I thought that it can turn on somehow, but no! I don't know why had all that feeling at that time - cuz of my life principles, or i didn't like the guy or my girlfriend enough as a sexual partner i mean, or something else. I'm sure here are some people including girls who would get excited on my position and would join them. Or who knows may be i'd join the couple if on their place were different people - i really don't know. I just say about what i felt at that moment...
Now, remembering that, honestly i'm glad it happened to me, just now i know what kind a feeling i can have. But repeat one more time - it's just individual case -exactly that guy and that girl - and i had this kind of emotions. But I also never know if the situation would happen to me again with different people what i would feel and do.
p.s. I'm still friend of that girl,