<human>: Could you distill the essence of the text into 1-3 sentences?

I was walking through my friend's room after a party, it was the only way to get in the apartment from the porch where we were smoking, to see a girl (who had just puked her guts out in the bathroom for a solid hour and a half) "cuddling" with two of my friends on top of a bed with their clothes on. I joked and remarked "this is the closest thing I've ever seen to an Eiffel Tower!" and my other friend jokingly said "why weren't we invited to the orgy!?" These comments sparked a conversation with all of the guys in which we were just kidding about various sexual fantasies, as if they'd happened. All of a sudden, this girl, completely serious and unaware that we were joking, starts divulging all of the details that led up to and included her first threesome. 

Now, I realize that some people are more casual about sharing their sex life and whatnot, but I could definitely tell that the alcohol played a large role in her sharing her experiences. What has me so hung up, though, was how she included the word FIRST!!! This girl came off as super innocent and certainly not the type of girl that would seemingly have a threesome (let alone more than once!), but I guess the quiet and innocent ones are the ones you need to watch out for!
<bot>: Very drunk girl (who I thought was "innocent") starts vividly describing her FIRST threesome after a bunch of friends were joking.