This happens to me a lot and the reason I think it does is because I’m good looking enough that the woman could potentially get herself in the mindset that I’m attractive but not so good looking or masculine that I intimidate her existing boyfriend. I’m in that sweet spot of approachable non-judgmental, in decent shape, good attitude, kinky predilections, and I can make people laugh.
I have been approached double digits number of times which led me down the same thought path as you.
We’re low risk targets lol