Bedroom activity on the boat? Definately the N20 since the trampoline is free from the jib sheet crap that can dig into your guests back when you don't want it to. I can even give you advice on which beachweels lend themselves to fun activity with your signifigant other as well. And if you have the opportunity to get past "R" rated with more than one female at a time, the H21se is the winner hands down. Now, would anyone like any advice as to wich harness to use? I have a story for that too.