There are two possibilities, one is that your husband has some vibrations in his hand which become pronounced when he touches you—maybe he will feel them when he is relaxed
and touching something else too. Shaky hands can be due to stress
and anxiety, too much
consumption of caffeine or alcohol, low blood sugar (hypoglycemia), autoimmune disease like multiple sclerosis, thyroid disorders, nerve compression, and liver disease.
The other possibility is that you have a pelvic condition.