How would they know? Don't under-estimate how intrusive elders will be when they decide they have the right to know. This isn't a sterilization story, but I was in a cong in Aberdeenshire, and the elders did not permit Scottish brothers to wear nothing under their kilts. At the KH they kept a mirror taped to the end of a long stick, and if a kilted brother turned up, he was made to stand over the mirror to prove whether or not he was wearing under-pants. No joke.