The first time I (38F) had fun with a stranger.
When I was 19 i was dating a guy who was older than me and he introduced me to a lot of different things, one of them being swinging.
So anyway, he'd spoken to me about the idea once or twice and I wasn't really sure about it but one night he had arranged for me and him to go to a pub with some friends, after a few hours we decided to call it a night and head home but one of his friends needed a place to stay so my bf said we could all go back to his place.
Once there we had another few drinks and me and my bf started to kiss on the sofa, after a couple of minutes his friend came and sat down next to me on the other side and my bf pushed me towards him. I was a little nervous and apprehensive but his friend leant in to kiss me and after a quick peck on the lips it started to escalate to making out.
I didn't know but as we kissed my bf had left the room and when I looked for him his friend told me he'd given us some privacy, so we ended up sleeping together on the sofa, it wasn't particularly good sex tbh but the whole situation was pretty hot and it remains to be a memory I don't think I'll ever forget.