I nominate myself for this thread: http://www.pua-zone.com/showthread.p...t-of-great-sex
1. It's so god damn important
2. It's highly underrated
3. I'm very cool. But more seriously, putting it in the HoF will draw attention to something important and underrated. Guys should try the advice in that thread and report back. In my experience variation of penetration depth is a really big win for both parties involved.
I only regret the title. Instead of "Penetration amplitude" I should have used "Depth variation". Much more to the point.