Hey,
I'm so sorry you had to go through that with your ignorant, pig-headed sister, but our fried BabyG is right - kink is all over the place. You could do a lot worse lol. I've been on fetish websites and there is PLENTY there that freaks me out and you'd have to know me to know I'm a little difficult to stun.
Big boys = bears right? Nothing to be ashamed of Darlin'. I don't mean to make light of it, BELIEVE ME I DON'T, but there are so many bigger problems you could have especially around these parts. I should remember that myself because I'm sounding like a hypocrite to myself, but embrace it. There is absolutely nothing wrong with it.
I hope you can find peace with yourself over that b/c I know what it's like to hate things about yourself.