my wife did that for about the first year we were married. led to a lot of sex. I asked her about it and she told me (again) that it was now "her dick and balls". she also told me it made her feel secure to hold it, and she liked fucking me a lot, which I already knew. This stopped after awhile but not the sex. she required "servicing" several times a day. she sort of changed it up after a few years. she would just pull the covers back and started sucking my cock in my sleep. of course, I would wake up, my cock would stand up, and she would ride me til we climaxed.