I do not any any such stories. And not going to make up shit.. But I gotta say, I'm quite amused..

She had to go into the chiropractors 3 times a week for treatment due to all the blow jobs she gave. Guess it's similar to carpal tunnel syndrome but cockal suckit syndrome.

I still have back pain...

From a partner who loved both sex from behind, and a firm hand around the neck while he did it. Caused me to bend backwards for pretty much the entire duration of every encounter. I still feel the strain when I try it now.

I'm sure every woman who gives enthusiastic BJs can also sympathize with the locking of the jaw and strain of the neck, and I've fallen off the bed so many times I'm surprised I've never broken a bone doing it.  

I used to get horrible leg cramps in cowgirl because I'm pretty...excited about it. I mean lasting hours. But now I make sure to stretch.

Got punched by a pussy...

The first session with one of my absolute favorites ever had me on the bottom of a 69.  She must have enjoyed what I was doing because she bucked her hips and her pelvic bone smacked me in the face.  I literally saw stars and noticed later that I had a fat lip.  LMAO!  She also was notorious for gouging my back with her fingernails while fucking her.  Years later, during a double that I believe remains listed in my reviews, I returned the favor and accidentally whacked my head in her face when I was blindfolded while our play partner had me hooked up in a sex swing playing with my ass whilst said ATF was coming in for a kiss.  Good times.

A friend of mine once had an over-enthusiastic client bite her during DTAY.  He actually cut the hood of her clit and drew blood.  She took a selfie and emailed it to me.
As for myself, I've been lucky.  The only incident I can recall was years ago, pre-Internet, in a cat house in Manhattan.   The gal I was with just didn't turn me on and had to finish me with a HJ.  When I finally erupted, I shot myself right in the eye.  No harm done though.

Back in the pre HIV days, also Mr. Fisher.

I was in the service.  After a rather spirited session with a girlfriend, I was left with several avulsions from her fingernails on my back.   Not scratches.  Four inch by quarter inch furrows in my shoulder blades.  Although I've always had great hygiene, they got infected.  To the point of fever and all kinds of nasty stuff.  Went to sick bay, where I was treated, but not without they snickering giggles of the medical officer.  By the time I got to dinner that night, the whole wardroom knew and gave me a standing ovation.

Another girlfriend and I were both extremely inebriated.  We got going and she decided to sit on my face.  She really got into it, she was lost in the moment and started to smother me.  The harder I fought, the harder she clamped down.  I passed out and woke up on an ambulance stretcher.  That's not the worst part.  I was a NYC paramedic at the time and this happened in the district I worked in.  So not only did I have to endure the ribbing from the other crews, there was also the ER staff and the guys at the firehouse.

The stupid stuff one does in their 20s.