The thing is with a kink like this; it's based on stereotypes that on the surface and perhaps even after deeper analyses is inherently not widely accepted. On the internet it's great that this whole 'thing' took off. But what exactly is this 'thing'.
Cuckolding, hotwiving, black bulls, MWF, white bois?
That's what this thing is on this website. Sleeping with a black lover might get discussed with friends if the peer group one finds themselves in is tolerant of this. Emancipation and all that...
But not the kink we discus on these boards. The swinging lifestyle is often just shared with like minded friends. A lifestyle based on racial play is even more socially awkward to confide a friend with. It's because we live in a society full of old stigmas and anti sex doctrines. That's why it's not something you share freely if you hold a position in this society where these 'values' matter.
This however is exactly why most of us enjoy this kink so much!