Haven't found an opiate yet that didn't have the shitty sexual side effects. Only reason I don't do them all the time. If someone discovered an opiate that didn't have it or even better work as an aphrodisiac they'd instantly be a popular person.Hence why Quaalude was called heroin for lovers, a strong downer that's good to fuck on.
I have wonder if the sex shit is caused by either opiates blocking the vagus nerve, which is involved in orgasm, or due to lowering luteinizing hormone, thus lowering testosterone. Maybe both? If it's from luteinizing hormone maybe there's something that could be taken to counteract it?