Sudden changes in G-loading (such as when a rollercoaster or airplane transscribe a parabolic arc) have been known to produce spontaneous orgasm in women since the 1920s. The sudden change from positive-G to negative-G loadings, or vice-versa, with the accompanied feel-good slammage-around of the girlybits, is the most commonly accepted cause. I've known several women who've described it on rides, turbulent airliners, and light planes piloted by devious boyfriends.
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