While this may be true for capsule
missions, technology has advanced somewhat, so that astronaut
s traveling on the Space Shuttle
now have an actual toilet available to them. Although it has been the butt
(ahem) of many jokes
, it must be considered a massive improvement over diapers and catheters, Texas or not. :-)
I would presume that the facilities on the ISS (and Mir, and Skylab) were also more advanced and consequently more comfortable to use. They are, of necessity, unisex.