I can say from experiance that there is absolutely no relation between "rough sex" and "domestic violence"
Hmmm, i need to be more specific, "heathy rough sex"
If its just bitting, and clawing, and bumping and grinding, good ol' fasion rough sex, there is no relation.
If, on the other hand, it's him taking control, not paying attention to your needs and trying to always have the power, there is.
Domestic violence is always about power needs... If its rough sex you both enjoy, don't worry about it, if its rough sex because he is tossing you around trying to be the boss, be a little worried.
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