This word is very odd. Its use in erotica has led to a strong connotation with sex when in all actuality it just means wet. Try it some time. When you walk in from the rain walk up to the first person you see and pronounce in a loud voice: "I am moist."
Regardless of your gender I guarantee that you will get a strong reaction. Usually a laugh from your friends or fear and shock from strangers will result. Somehow an announcement of: "I am wet" just isn't the same, even though they are for all extents and purposes synonomous.