A question about masturbation

I am trying to figure out if my wife masturbates or not. Sex is not a top priority for her and I am satisfied with sex once or twice a week. When it comes to masturbation I do it a couple of times a week (or more when haven't had sex for a week or more) and I enjoy it a lot. I just don't think my wife does it at all and I really think she is missing out on a lot if she doesn't do it regularly. She doesn't have a lot of free time on her hands, but based on my own experience I can't imagine that someone doesn't masturbate. Is it at all possible that she just doesn't do it?

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