Maybe it's silly but I was thinking that instead of streching you out the cups can act as the of geisha (spelling?) balls. Basically the theory is that inside that ball or that tampon thingy there's a weight that constantly moves so your vag. muscles have to work constantly why you are moving to keep that thing in place. Correct me if I'm wrong but the discarge can work as the weight (just lighter) and the cup as the geisha ball, just we have one ball in this case not two or or hourglass shaped... Have you experianced any positive changes regarding to your vag muscles?