I think a wife would enjoy it more if the husband would leave the room and let them be alone. She could focus on the bbc and not the husband being in the room.
your point is right and that's the case for many white women. but not for everyone. For example, a few years ago I convinced my beautiful slutty 45-year-old Italian wife to get fucked by two black work friends of mine. she was first time bbc. since then she was 37 years old I always got fucked by BBC. I managed to make a very beautiful slutty lady become even more slutty. I can say that thanks to me, I became the slut of my black friends.