While two men are having missionary style sex, the receiving individual in the bottom position rubs his preferrably moist, erect member across his lover's belly in a sweeping motion, comparable to that of a windshield wiper.
The windshield wiper can also be enjoyed by straight and/or lesbain couples with the assistance of strap-on dildos.
Call the Mechanic! That windshield wiper only made things wetter!
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