I include anything with feelings as polyamory. I think FWB can qualify because feelings are involved. I think polyamory is most often a sub-category of open relationships, which include more things (some poly relationships however aren't opened, such as polyfidelity).
Open relationships include casual sex for me and anonymous sex and anything like that.
I don't think being polyamorous excludes having also casual sex. But if you only have casual sex outside of a single relationship, I don't think that's polyamorous, I think it's another form of non-monogamy. Poly requires being open to more than one relationship.
I think the map of non-monogamy is needed again! Here you go.
Open relationships include casual sex for me and anonymous sex and anything like that.
I don't think being polyamorous excludes having also casual sex. But if you only have casual sex outside of a single relationship, I don't think that's polyamorous, I think it's another form of non-monogamy. Poly requires being open to more than one relationship.
I think the map of non-monogamy is needed again! Here you go.