What are some good exercises to increase flexibility for sex?

So I've seen a few adult videos where the actors are acting in the missionary position but the receptive person laying on their back has both their legs stretched out to the side as if they are doing the splits. I thought it was kinda of hot and want to learn how to do that for my man. What exercises/ stretches... show more So I've seen a few adult videos where the actors are acting in the missionary position but the receptive person laying on their back has both their legs stretched out to the side as if they are doing the splits. I thought it was kinda of hot and want to learn how to do that for my man. What exercises/ stretches are primary good for achieving this? (I hope I dont get flagged or anything, because I'm being so serious right now. Lol)
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