>>937463540They know, it's just the extreme part of the ntr/cuckold fetish so it's not that common.
First you get a better/younger/bigger man (boss, coworker, family member, neighbor, friend, etc)
Then a hung/clever kid.
Then a tanned blonde "criminal type" jerk (it can be white foreigners here)
Then hung futa/femboys.
And then black men, as they're foreigners but a step forward due to stereotypes regarding size.