riding on the handlebars 

On your back, one knee up. The other leg is crossed in front. Your partner sits on the second leg, availing his / herself to penetration. Can also be called 'bird on a perch'. Courtesy Patton Oswalt.

The night out with my student was, like, a total bore until he asked me if I've ever gone 'riding on the handlebars'.

riding on the handlebars by @piledriver911 September 27, 2014