During a sex
act in the doggystyle
position, use ones hands to give oneself moose horns by first making a fist with thumb and pinky fingers fully extended and placing thumbs on opposite sides of ones head and angling for maximum pinky extension.
Extra credit for mouthing a big moose call and/or not laughing.
Extra, extra credit for negotiating this maneuver in front of a mirror without partner noticing.