if the girl is back against the tank, head under the windshield into the cluster almost (have to use your gloves for a makeshift pillow) and you prop yourself up on the rear pegs and handlebars you can swing her legs over your shoulders and go at it for quite sometime...the geometry is damn near perfect...just need some good upper body strength.

as far as doing it while riding, ive just gotten a girl off once, it was funny, cause it was her 1st time riding. she knew why i asked her to wear a skirt and no panties...thats always fun as shit playing with her clit going down gulf blvd. grrr...shit like this makes me want to get back on a bike again lol