one of my favorite themes. why ?
well, it's hard to explain. when i was younger i saw a scene from a movie which featured a muscular guy and a beautiful woman who wore a collar around her neck while serving the guy. it wan't a porn but one of those cheesy erotic movies.
although little, innocent me didn't completely understand what that was all about, i was still hooked. seeing that scene did something to me that i couldn't explain at the time.
i guess it was one of those key moments which most kinky people experience.. when you see or do something that kinda goes against social norms... but despite that you get that feeling of "fuck, that is SO hot. i want this in my life".
that, for me, was the magic moment and i'm hooked ever since.