I think it is.... subjective ? idk i am not quite sure
The three main functions of the human digestive system are to break food down into chyme for the body's use, to secrete and absorb nutrients and bodily fluids into the gastrointestinal tract or the blood, and to store and eliminate waste. The digestive system has major parts and accessory parts.
Its probably personal beliefs or peers. because if your religion doesn't allow you to have sex until a certain age or until your married then that can get in the way. but peers pressure friends/people into doing things they aren't ready for