Just to help the devs with this one, does their need to be a categorisation as to whether or not the hand that touched the peripheral was the fap hand or not? That is, if I'm a lefty, I'm going to load up redtube, and be able to browse away with my mouse hand, while I'm free willy with my off hand, whereas if I'm a righty there is a high likelihood that if I'm going for a stamina session, then I'm going to have to choose another video, and thus peripheral touching will occur.
This also raises - will we need to have any addition in respect to "fluids" on the peripheral. Again, referring to the stamina session, we all know that an extensive fap can create phenomenal build up pressure, and you sometimes give no shits about the direction when you're about to hit the end goal and so there's a possibility of contamination.
Just a few more intricate details for your requirement specification needing to be cleared up there.