Infrequent participation in physical activity can lead to

a. high blood pressure during exercise
b. muscle strain and soreness after exercise
c. extra calories burned during exercise
d. low heart rate after exercise

when you rub, you also apply pressure, that pressure can urge the poop to come out. i think that when your rubbing, you also might be slightly breaking it up and that can further fill the stomach.  

myth: mosquito bites transmit hiv. & shaking hands often transmits hiv. & oral sex never transmits hiv.

fact: breastfeeding can transmit hiv. & unprotected sex transmits hiv.