Sorry for my English!
In my case I’ve been taking a VERY small dose of Alprazolam (Xanax in the US) for like 6-7 years.
2 months ago I decided to cut the pills off and I did it cold turkey.
In the second day (I was still with withdrawal symptoms) I masturbated and I didn’t feel anything while I was having the typical orgasm spams. I was like: what is this? it still persist.
In my case I think it's directly related to the fact that I stopped taking these pills (if not, what a coincidence...) It could be nerve damage (cold turkey), an hormonal problem...?
I will wait some more months until may chemicals are balanced again, if the orgasm sensation does not come back it will be a very boring rest of my life at 35. Please keep posting, this problem deserves more visibility in my opinion :/