Guy Gardener wrote:
Close to his asshole are his balls, and maybe they're enlarged?
If that's the reason (or should that be "if they're the reasons"?), then keep Stewart wearing pants. I've read his nickname was "Tripod." And was that really him 'naked' in the Cardassian torture scene? I recall we saw a very naked hip (so no covering there).
The standard practice for such shots is for the actor to wear a special sock tucked over the, er, body part in question, so that they're not completely
naked on set but when the camera shoots them from behind it looks like they are. Protecting the actor's modesty while still keeping the reality of the moment in terms of what the camera sees.
Perhaps the question ought to be what size sock it was?