This presents to me, no difficulty. Men, while admittedly, simply programmed , we are not complete idiots. This is especially true when we envision a little bit of nookie at the end.
Why not get a copy of the Seinfeld episode where Jerry and Elaine engage in a conversation about having "friendly" sex when they were no longer a couple. Just unattached hot sex and no expectations that ruin their friendship.
Its a subtle hottie that, if he doesnt get it as you watch the episode together, you can assume that he is without a pulse.
There was also an episode about how they "liked it" . (Jerry would engage in a little "swirl" at the end ) and ELaine admitted how she liked that move.