For me it was choking. I always thought I'd hate it and it was just too far. Then one night my boyfriend gently grabbed my throat and my mindset instantly went from, 'I will never want to do this ever' to, 'Oh fuck. Oh. Oh this is fun'. I know it's not that big of a thing, but it's sort of made me a lot more open minded now. Looking forward to experiencing more with this dude. He's had *a lot* more experience sexually than I have (he was my first, I am far from being his first) and holy shit this dude got some tricks. It's a whole new world, friends.