Gay porno self sucking

Hi there,I'm curious to know if self sucking can cause any type of kidney problems or any type of cancer due to self sucking. Also can self sucking cause any health issues? I was wondering is there any health risks doing this, and is it safe for my spine since I have been doing it so long and nothing has broken? Also why is it that sometimes I can deep throat like go all the way down without my back hurting at all and sometimes I can't reach with out pain in my back it helps sometimes when I have trouble reaching to take a hot shower or bath first then It is easy to reach without pain I'm guessing the heat softens my back muscles that are stopping me or something.

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