I am female, but something similar happened to me when I took Prozac. All the feeling went out of my clitoris. It was like a rubber band with no sensation in it at all. I immediately stopped taking Prozac, but it took a few weeks for the sensation to return, and it was years before I my sex drive returned to it's original state.
Had you ever smoked spice before? Had you ever smoked it and spank the monkeyd before? If so, and no harm was done previously, I think maybe you got hold of some spice that was cut with a salt peter herb. Sounds like your dealer is due for some bad penis karma in another life....
Have you smoked any since this happened? (I hope not!)
Definitely give your penis some time to rest and recuperate.
Don't spank the monkey for a week or two, or maybe even a month.