24 hours after sex you realise you're in pain. Aches. Pains. Random bruising.
Guy - Last night was amazingballs !

Girl : Yeah, but hell... I've got a sex injury! My hip is in so much pain and I have a bruise on my ass !
by TheChristmasBitch December 1, 2013
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An injury that happens during sex.

Physical trauma that occurs during or because of sexual acts, leading to a noticeable injury that often has to be explained to others.
Bob: "Why are you limping?"
Dave: "I feel out of bed, when my wife repositioned during sex last night."
Bob: "Nice! A sex injury."
Dave: "Yeah, thanks."
by Orik T. Viking December 12, 2021
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