Instead... just Add Foreskin!! better than ribbed condoms anyday!
you bring up a good point.. I mean its realitively easy enouth to create a sleave that fits over the guy's veiny, nodule laden meat sausage.
Imean they make this gelantine sleave that serves as a sex toy for men...
http://www.xxx-sextoys.net/uimg/him/realistic-vaginas/him-vagina-anus-21.jpg
it kind of glides along the shaft. I've seen these kind of gelantin torus shaped cylinders (and enclosed gepatine substance thats cylintrical, and hollow in the center, allowing it to kinda roll along its center axis) used as a treatment against repetative wrist injuries.
So imagine something that has the base of a tight fitting condom along the shaft... and the tip where the guy's knobus-Hemutus is there is this faux foreskin sleave that can glide up and around the head and down along part of the shaft. using wither artificial lube or a woman's lust juice. It would have to be a little high tech, and technically not a VD deterrant... just a stimulus toy.
that would be interesting...