Thumb pressing turns me on

I think that sex and pressure go well together.
When I was a child, I started becoming turned on when people (especially women) pressed their thumb against something (reading a book, pushing a button) so that it looked a bit bent or the pinkish skin turned a bit more white. Strangely, I've admitted being turned on by so many things. Butt, Boobs, face, perfection, imperfection, youngness, oldness, men, women, black, indian, white, raping, being raped, bestiality, violence, video games, hands, feet, obesity, anorexia, bad smells, and even calves (legs, not a young cow). Yet this thumb-pressing turn-on is the one I am least comfortable discussing.