back in the olden days cp was called n.s.u.
non specific urethritis
slang for it was v.u.d.
various unknown diseases.

many a trooper in vietnam was held back from coming home when
they were diagnosed with v.u.d. they were  sent to the philippines
for prolonged treatment with abx's until they were supposedly
cured.
i think this is where cp originated and has been with us ever since.
i honestly believe it is a non contagious venereal disease.
i do believe it is caused by some kind of yet to be discovered
superbug