I think we may have a different take on the term social stigma. Per the common usage of that word, as well as the way it is used by researchers such as Erving Goffman, I generally perceive things such as sexual orientation and gender identity as part of what is referred to by social stigma. To me it seems that gaining greater rationality is generally associated with less ugh fields around sexual orientation and gender identity, as well as relationship styles such as polyamory. I accept that we may have a difference of opinion, however.