So if I was a chick (and I tell you, apart from those times I'd love to have some tits to play with, most of the time I'm incredibly glad I'm not) I would do this myself; get a custom made dildo that will hit all my sensitive spots exactly how I want them to...

Only difference is that I'd probably wait til I wasn't having my period (not exactly the cleanest way to measure things now is it) and I'd try to find a super hot dude to take my pussy measurements so that after he was done we could see how well his own cock could satisfy my horniness.