Ironically, looking in peoples’ pants wouldn’t solve the GOP’s bathroom dilemma. Their position is you have to use the bathroom that matches your gender at birth. So if someone had a penis at birth, under the GOP rules they would have to use the men’s room, even if they have had a sex change operation and hormone therapy and wear women’s clothing, have boobs and no penis. And the same would be true with folks whose birth certificates say (F) but have had sex change operations and dress and look male - they would be required to use the women’s room.
Basically their absurd position would lead to exactly what they fear – that their sons would be walking into a bathroom with female-looking, female-dressed people and that their daughters would be walking into a bathroom with male-looking, male-dressed people.
Of course in the GOP fantasy world, nobody would be allowed to get a sex change operation in the first place, so, no problem. But as usual, legislating based on their fantasy world leads to paradoxical results in the real world.