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Actually... I also get jelly legs after it, haha, they have even failed me before. My best friend (he's a guy and has a partner of the same sex) has suffered from this too, not as often though. I guess it all depends on your body and partner.
This is so embarrassing but I just wanted to share it to let people know that it can happen, haha
This manga phenomenon of randomly completely losing the ability to move one's legs :D