I imagine that some of the couples do pay (Tip) those young Jamaican guys for fucking the wife. I certainly did not mind paying that massage guy for what he did to my wife. Of course, he spent over an hour rubbing her naked body with warm oil, but when he started fucking her she went off like a box of fireworks. He was a pro. The side benefit was that he got my wife interested in letting some of the other Jamaican guys fuck her.
I noticed a cultural difference that I found interesting. The Jamaican guys are all about fucking. They don't eat pussy, or 'go downtown' as they call it, and they don't expect the women to suck their dick. One guy said that he does not even know where to catch the bus to go downtown LOL. Their sexual prowess seems to be centered on how long they can fuck and how many times they can fuck.
My wife is a very good looking blonde and American blacks always eat her smooth shaved pussy for long periods of time. Eating her pussy does not even seem to enter the minds of the Jamaican guys who get to fuck her and none of them have ever suggested that she suck his dick. They get right to the fucking. The good news is that they really like to fuck. They fuck Kate for hours and cum several times during an evening of fun.
We did a swinger Windjammer nude cruise years ago. It was couples-only so my wife had sex with the Captain and with the First Mate. That was a fun time.