Is a nipple much larger than the standard receptacle? I was thinking of using something like a bulb syringe like you'd use for kid snot or ears and cut off most of the bulb. Seems like it would be softer against sensitive parts and wider so I don't have to fiddle with finding the urethra every time.
I ordered a new prosthetic and want to modify it for stp but I'm not a huge fan of the mango tubing.
Jay