Is it bad that I'm into bdsm?

Chloe
For those who don't know what bdsm is it's 
Bondage/domination/submission/sadism/
masochism. 
I'm 18 and I've always loved being slapped on the butt while having sex and I've been tied up before and I want to take it a bit further and do the Fifty Shades of Grey kind of stuff. 
I don't really tell anyone that I'm into that kind of stuff. The only people who know are my sister (she's into that stuff too), my best friend and my boyfriend. 
Is it bad that I want it sooo badly? 

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