I'm not sure about mainstream but it is common enough to not be controversial any more
Twenty five years ago; when I started to cuckold my husband and do it with young black guys instead it was a hot topic for months when the news got out, but over time people stopped taking any notice and it became perfectly normal to see me with young black guys.
Fast forward to 6 years ago, when a bull moved in with us and want me black bred; no one commented about Dr Obi coming to live with us. A few months later, when I was obviously pregnant, I thought I'd better tell everyone that it was black bred. The reaction I got was that they would have been shocked if my husband had been the biological father.
We now have five and my husband is so proud to be a *** again. We love having a new young ****** and we don't think that there is anything to be ashamed of when a white couple have black fathered children. In fact we think it will soon be quite normal for a white wife to be black bred after the white couple have had their own children.
"I'm not sure about mainstream but it is common enough to not be controversial any more"
Agree.
And it's about time.
Here's hoping it becomes part of school teachings, much like CRT and LGBT stuff.