During orgasm, many of our muscles involuntarily contract. It's common to arch our backs and clench our fists (or at least the one we aren't using!), and so forth. In your case, the muscles around your eyes are contracting. That's about all there is to it.
What do you think about when you masturbate or have sex? Would you tell your significant other if they asked?
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Every time I have an orgasm, it makes me close my eyes. How come?
