Muscle fatigue: Sex can be very physically demanding. Whatever position you choose, your legs are going to have a lot of work to do, either by supporting you or holding them open or up etc. The prolonged exertion can cause your muscles to tremble. Dehydration makes it worse. Over time, with practice, you "get in shape" and the problem usually resolves without treatment. If you are used to long sex, take a break!
Answered 10/27/2020
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