Butterfly Stroke
Sexual position similar to missionary, but the guy uses the headboard to hold his weight up, which makes it look a lot like he's doing the butterfly stroke in bed. Popularized by leaked footage of the movie Breaking Dawn. Almost guaranteed to make a girl faint if she likes sparkling vampires.
I didn't think my boyfriend knew anything about the Twilight Saga, but then he tried the butterfly stroke on me in bed. He can't deny it anymore.