Masturbation while married or living together?

summiter
Being a single guy (in a friends with benefits relationship) I have always wondered if guys (girls also) who are married or living with someone masturbate on days off from sex. Is it often? I guess, without getting too personal, why do you do it? I ask this out of curiosity and certainly not to judge.
Updates:
+1 y
If you do masturbate, does your significant other know about it?
Masturbation while married or living together?
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