People who experienced "porn-like" situations, which ended with real unexpected sex with some stranger,plumber or pizza delivery boy, how does it happened?

At first none of my friends believed me when I told them this in full, but I assure you this story is true:

When I was 21 I was back in my hometown where I grew up and was out at the neighborhood bar. Out of nowhere this girl walks up (We'll call her Irene because why not) and says "I've been looking at guys all night, and you're the one I want to have sex with.". I said okay. She was with a friend of hers, another woman, (We'll cal her Rhonda) who must have been in her mid thirties. Rhonda said she would take us over to her place and we could bang there. Rhonda also asked me "Do you like Spider Man?". It was a very odd question that seemed out of context but I was wasted and of course I did so I did not question it and replied "Of course, I love Spider Man." Fast forward to about an hour later and me and Irene have been going at it for a while in this room at Rhonda's house she has designated for our sex. At one point Irene and I want to do anal. Out of nowhere (I say out of nowhere becuase I was very intoxicated at this point) Rhonda us there naked and says "You're gonna have to have lube for that", drops it off, leaves the room. Me and Irene start trying anal, but it's too uncomfortable for her. At this Rhonda enters in and starts making out with Irene, so I back up, and then Rhonda starts going down on Irene so I enter Rhonda. From there it was a whilrwind of crazy porno things. Irene riding me on top, Rhonda pulling me out to fellate me only to insert me back in to Irene, both of them going down on me, us just standing and all making out while I pull their hair, it was fucking awesome. Well, a couple hours and several sweaty orgasms later from the initial sexual encounter, and it's time to call it quits. I got up to go wash off in the restroom, but as I was making my way in to the bathroom I realized I was stepping on multiple sharp objects, but didn't know what. It was killing my feet. The lights come on and I put back on my clothes but I'm too drunk to comprehend and register the contents of the room. I say my goodbyes and safely get home. In the morning I wake up and have a startling sober realization. What I had been stepping on were action figures, and the sheets on the bed were spiderman. I had had a threesome on Rhonda's son's bed with her and Irene.

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