Why does the back of my knee/hamstring hurt during masturbation?

I know this is weird, but when I’m masturbating when I get close it’s almost like my hamstring where it connects to my knee starts hurts. It almost feel like it’s getting torn and a week ago when I bent my leg in it flared up and felt like I tore my hamstring. It hasn’t happened again but I still feel the tenseness. I also am just laying down straight since again, don’t wanna bend my knee and hurt it again. It is also more on the left side of my right knee so it’s like pain where my hamstring connects to my knee on the side closer to my body

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