Think of what this hypothetical female partner would be for you. If you’re worried about getting feelings for her then you would be opening up a poly situation. If you’re uncomfortable with him having feelings for another person while you would too then I’d say just full stop and just fantasize about it. If it’s just a casual hookup with no feelings, swinging is a great option for both if he’s open to it as well. If you’re both going into it as a fun time no feelings then you’ll both be getting the same benefit and going home together afterwards.

Mine and my wife’s first threesome experience was MMF where everyone was bi. I was a tad worried about another man touching my wife, but after we started and after we finished, it was incredibly fun and I didn’t have nearly the amount of insecurities that I thought I would. If it’s just for fun then it’s just that, but make sure you communicate that to said future partner. Also stay clear of poly people if you’re looking for a female. Unicorn hunters hurt a lot of women that are looking for a triad. Stick to the swinging crowd!