Does methadone lower chances of conceiving?

I personally have never read any information on methadone benig detrimental to conceiving in males, only in females (where it is a category C drug in the US; but has a relatively safe history of use). But, with that said, chronic use of opiates/opioids can lower sperm count, by degrading quality & quantity of sperm. This is more likely in higher doses (I would consider a high dose of methadone to be over 30 mg per dosage)