I think if the truth were told, and we all put our ego's to one side, As much as we critique Paul's apparent lack of interest in sex, could we all honestly do any better on a regular basis? with potentially thousands of horny bastards watching your every movement. We may be OK for a while but perhaps not for an extended time.
Yes, Paul is awkward and clumsy and sexually naive, and has never learnt the important things, like how to arouse your woman, or how to behave post coital...and possibly he is an unwilling partner in the RLC project, but only agreed because of his love for Leora who enjoys exhibitionism.
I have a certain sympathy for him sometimes, although some of his ways are annoying.π