who is nude?

Parker Posey and some kid... it's very brief. So, don't get excited!

Geez, some people get aroused by nothing...

There isn't really a "nude scene" like in most movies because "it" happens when Jayne (Posey) and Ray (Magnussen) are higher than kites. For a very few minutes we see Jayne lying on her back giggling. She appears to be in water and on top of a jellyfish. Ray floats over and above her in his tighty whities, and in a few more seconds his underwear is gone but he's still 2 feet above her. There is a bulge in the crotch of his underwear but when the underwear disappears the bulge is still there, i.e., gravity and/or or tumescence aren't in evidence. It's obviously his penis but how anyone can figure he's well hung escapes me. A few seconds later she looks at the soon-to-be fetus and it looks at her. Laura's (?) words "Everything turns out for the best" are heard and Jayne looks back up and the "dream" seems to take an ominous turn. Laura wakes Jayne up and sends Ray to tend to Joe. As they're discussing the events Laura asks how Ray was and Jayne says "We didn't have sex" but right after we see a flashback with Ray obviously, um, finishing making love...

Posey's breasts aren't shown and we see Magnussen from the side and one shot of his face and upper torso from above. Although Ray is clearly the father of Jayne's baby the sex scene is very surreal but not graphic.