Tristan Taormino said this quote
“ Fear triggers the fight-or-flight response, fueled by adrenaline, which, as it turns out, is chemically related to amphetamines. Granted, it's a very different kind of high for mindfuckers: not a mellow, floaty my vulva is one with the universe high but a jittery, revved-up oh fuck oh fuck oh fuck kind of high. Endorphins are like great downers but adrenaline is uppers all the way. And it's just as addictive. Don't believe me? Go ask anyone who likes to jump off bridges or out of airplanes. - Edge ”