It should be puberty because once a female starts her menstrual cycle she is able to become pregnant. The same should go for guys when it comes to their sperm becoming "active" in other words
Q. Stretching that is characterized by a bouncing action is called
A. Ballistic stretching
Staying abstinent can keep you free of sexually transmitted diseases and also keep your mental, emotional, and physical state as good as possible! At a young at(teens-20) sexual activity can actually harm some bodies, as they are not yet ready and matured enough. Also, when you are young it is hard enough to be emotionally stable, let alone having had sex and be emotionally stable. Remember there is always the word no, and places to stop. You can have a friend and a safeword for them to come get you etc. <span />
The effects of fatigue are not classified as learning because they are not permanent effects.