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.
Do you find yourself masturbating more often during some seasons than others? Why?
Answer this question | Suggest a question
Answer this question | Suggest a question