Hello, not all girls curl their toes when they orgasm but some do. Orgasm tenses up many of the body's muscles. This is just a bodily reaction to the feeling in which the orgasm stirs just like males may tighten their thighs and such. Not all girls do this and every reaction to an orgasm is different. Also the same for guys not all guys curd thier toes when they have a orgasm.
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