Taboo and dangerous and sexy and any number of lurid descriptors you can think of, what pierces through Tie Me Up! Tie Me Down! most of all is how unbelievably vulnerable and sincere it is, focused on two characters who in their own unique ways are equally longing for love. Pedro Almodóvar deliciously plays with perception and expectation throughout this story, drawing us into certain notions of what this dynamic is and who these people are, then pulling the rug…