I go about about 5 rides per pair of shorts. I have 2 pairs that were used when they came to me, and a used crit suit.
Never been scared of a little sweat or dirt.
I think my standards on dirty might be a bit different than some.
The army taught me there are 4 different ways to keep your undies clean....inside out, outside out X frontwards, backwards.
Took a little disease class in the college days that taught me one of the biggest contributing factors to getting sick and/or having allergies is being too clean.
Compare urban american bathing habits to Europeans.
Nowadays I wear clothes when I go into public; at home I sit outside in my boxers, sweat, and drink beer.
I still seem suprisingly successful at getting laid.