I have, but I am a straight lady, so the odds are different (I think it's easier to find men, whether you are a man or a woman, and harder to find women, again whether you are yourself a man or woman).

Though in most cases it was me posting, I got real guys on FetLife (even a husband, we are still together 15 years later) and Reddit, and a swinger site with a pretty big local population.

Have not tried in some years (health scare no more swinger-ing) but wouldn't be afraid to, again that's from the perspective of someone looking for men, though.