Long term pain management with opiates cause sexual dysfunction of 50% of all patients, both
men and women. It causes testosterone deficiencies in both
men and women, which is called hypogonadism.
Docs are supposed to monitor testosterone levels, but seldom do because the topic just doesn't come up in the Doctors office.
It's not just men that need to worry either, in fact it's of critical importance to women.
Check it out, there's a lot more to read:
pain-topics.