Having a 3 sum for the first time

lex

So I met this couple on a dating app, and I went and met them in person. They are super cool and I’m pretty attracted to them. But I just got all fuzzled and my anxiety put me in a fight or flight mode, so I left before anything happened. I know I’m interested in sexually exploring women which I haven’t done, but what is it like to be the 3rd person? What am I to expect? Need some advice lol also give me some good pointers! Thanks! 😬😂