This is totally your call, and none of us know your situation, or your relationship with your parents...
For me, and this is just my humble opinion, unless we're sleeping together, there is no reason for you to know my fetishes...it's one thing to come out as gay, or bisexual, or transgendered, or republican (j/k) but coming out about your tastes in the sack...well, I don't want to know how my parents fool around or what gets them going...and I would hope they don't want to know about my tastes either...
If you're living with them especially, I wouldn't do it...it's unnecessary...and potentially dangerous for you...
So, if you are feeling oppressed by the need to tell someone, find a good friend and tell them instead...mom and dad are not the best option, I'm afraid...
Good luck to you, whatever you do!!!!