Gasoline and steel wool works.
I remember back in highschool, we had unisex gym classes.
We were sitting on the poolside as the teachers took attendance.
The woman gym teacher saw the girl next to me fully clothed.
"Liz, why aren't you going in the pool today? Are you having your period?"
Liz answered back, " no, I got the crabs".
The gym teacher moved on to the next student.