I have an issue with that getting frequent sometimes and it is somewhat addictive when I get that way. It is for the fleeting short euphoric feeling of orgasm. My wife has had zero interest for a while. I doubt we are together in two years when the nest will be empty or it will be kids who really aren't being raised anymore. Youngest may be living at home, working and going to community college. The self service lane is no substitute. Sometimes I tell myself it is just to make sure the equipment is in working order, but I know better.