When two lovers are having sex and the man will just lay on top of the woman. Now their is no pelvic thrusting or humping required, just sensual eye contact. This should take about 1 minute if the two concentrate and their focus is not interrupted.
Bill: "Dude last night was so effing tiring with Meredith!"
Bill: "Well, we were going hard for a while, and then I got tired. So we tried the Manatee minute. It worked like a charm."