Hi,
For several years I experienced the problem which you have mentioned. If you touched the scrotum, the skin was sticky and would even adhere to your finger. I went to dermatologists, explaining the problem, but there was never any solution.
Recently, my physician discovered that I am severely deficient in vitamin D. I was prescribed a supplement for other reasons, and now I have noticed that the scrotal/penis stickiness is gone.
I hope this will help any man experiencing the problem as I know how isolating the problem can be. I went through times when I thought I would never be with a woman again.
All the best. Also, a person can have too much vitamin D in the body--check with your physician to have levels checked.