So what is it

After some intense loving from the hubby, I began to wonder what it is about getting a hummer that turns a man on most. Is it the sound of the lips on the tip, the loud sucking that fills the room when my mouth is full, or is it the sensation of me running my tongue quickly just under the tip of the head, you know the part that flares out like a swollen football helmet? I've never thought to ask and since I pretty much rode him to sleep I couldn't ask him. Feel free to answer if you know.