as we all know, selfing uses stretching of the leg,back,and neck muscles to be done, and the more flexible you are, the better you can do it. but does the flexibility have any relation with the amount of muscle mass you have? if your muscles are bigger in your neck, back, and legs, does that mean it will be easier to get more of your dick in your mouth?
my point is, does flexibility increase with muscle mass?
Muscle Stretching for ssing....
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