Dear friends, as best I have been able to determine - and Mikey has concurred on this site - we do not have physical sex after death. Nor do we miss it. There is instead a kind of merger-based energy exchange - what Mikey calls a hug earlier in this thread - which is apparently more pleasurable than sex and has no morality attached to it. I think it was Bob Monroe who talked about having this experience while astral-traveling in the Summerland: he met a group of several men and a woman, and the men goaded the woman into showing him this pleasure-merger-hug sort of thingy. Gender doesn't matter, but they thought Monroe might be creeped out if a male body tried it with his male body. Now, Monroe's astral body was not precisely the same as a Summerland body would be, but he said that the woman stepped into his body-space and then out of it again and he was surprised to find that her doing this produced an intense, tingly, energy-based pleasure. Just another little something to look forward to ;-)!!
There is probably a lot about the afterlife that can't be described in terms that are limited to this life.
To tie this back to my original question -- it makes sense to me that sexuality in its purely physical sense, would have no place in a world where there is no need for reproduction, just like food or rain would not be needed. The mechanics of such a world are just different.
Plato wrote about an idea, called the Theory of Forms, that individual things in this world are just replicas or images of the true universal thing. I'm sure I've stated that in a ludicrously oversimplified way -- but this sounds related to what Roberta has shared about the "soul-merging" -- the feelings of intimacy that is the best part of our sexuality is just a preview of much deeper intimacy that will be possible in the future. Maybe that's true of other things that we imagine we will miss in the future. Perhaps the satisfactions of good wine or a summer rain or beautiful music are all just shadows of future fulfillment of some kind. Much like a painting of the beach can be beautiful, but it's nothing like being on an actual beach.