I (a lesbian) briefly dated a (bi) woman who was in a polyamorous relationship. I had never done so before but I was really into her so I decided to give it a go. While I was the only other person she was dating at the time, her boyfriend was extremely active in the sex party scene, and it didn't take me long to realize how deeply uncomfortable I was with that. Lots of sex with random people is just flat-out dangerous, and no method of protection is fool proof.

I'm pretty happy being monogamous and at this point see little benefit to the drama of poly.