> an epidemic of erectile dysfunction

Ok, that got a chuckle out of me. But really, as a serial porn consumer, I can tell you that people don't progress towards more and more extreme stuff. This isn't like drugs where you start developing resistance to the active substance. If it were, we'd see people give up sex in a few months after starting and the entire human race would die off.

You're basically designing a system for perfectly horny teens in frictionless vacuum.

Another thought - someone should get PornHub to release stats on if and how people's tastes in erotica progress.