Answer:
Stress is your body's reaction to the demands of the world. Stressors are events or conditions in your surroundings that may trigger stress.
Adrenaline during an intense situation
Uuuuhhhh....I'm gonna assume its clinical and nonclinical.
Teenages perceive sexual activities as exciting and good. They think that is will be OK if they go ahead and try those things. When in reality, it will put them in greater risk of STD's or STI's, or an unwanted pregnancy. :)
Because you yourself know you're going to tickle yourself so it's no surprise so you don't feel that tickling sensation