A friend who was "too friendly with the natives" got himself a good dose of the "crabs" back in the seventies in Africa. He was bemoning his condition and asked for a remedy. I told him to swab himself with parafin( not the wax, that smelly varsol/kerosene like stuff that is used as lamp fuel abont other things in the third world.
Next time I saw him he almost killed me - but I asked him "did it work"? He answered yes. "Will you be careless enough to catch then again, knowing the remedy?" He answered "HELL NO!!!!"