My experiences with three-or-moresomes have always been as a result of the same methods I use to find any date -
- I socialise,
- I meet people,
- I spend more time with the ones I like,
- I get to know them better,
- we see if we like each other,
- we see if we fancy each other,
- we discuss our personal circumstances,
- we discuss whether proceeding further is likely to be agreeable to each of us.
- we try stuff out to see if we enjoy it
- feelings develop, or not.
Personally, I've never understood why so many people seem to think that finding a partner for erotic activities is any different from finding any other kind of date. I mean, if you're looking for a sex worker, that's one thing. But I think that seeking a socially and sexually compatible companion, even if it's solely for sex, can really only be effective if it's done through the usual dating channels. Socialise and meet people, and/or go on a dating site(s). What other avenues for this can there possibly be?
I cannot understand why any other approach would be successful for people who are not sex workers. I know that when I'm approached as if I were an unpaid sex worker (i.e. to solely provide uncompensated sexual services), I tend to disregard those approaches. When I'm approached as a human being, I'm much more likely to feel positive about that.
So far, I have never successfully found any date via any online dating site. All of mine have been through social encounters. I'm sure if I kept trying I would find at least one date that successfully progressed to an erotic encounter from a dating site, but so far my most effective approach has been through face-to-face socialising.
Good luck. :)