There is a link between black coffee preference and alcohol preference, such that if a human possesses the proper combination of taste buds that predispose the human to prefer bitter-tasting foods (brussels sprouts, black coffee, etc.), they may be at a higher rate of predisposition for alcoholism. Alcohol is bitter. That is why we sweeten it prior to consuming it. If a person prefers the bitter taste of alcohol, they may tend to consume larger quantities, upregulating dopamine and forming an addictive pathway. Of course, liking black coffee doesn't mean you are guaranteed to become a drunkard, it is just one possible predictor. I despise black coffee. I can't stand my coffee tasting like actual coffee. I like a beer every once in a while, but still think it tastes somewhat aversive. Peppers on the other hand are quite tasty. I can not think of a possible third variable or link between black coffee and peppers. Was it related to the feeling more than the taste? Maybe the dopamine/endorphin rush? Peppers cause pain and discomfort, prompting endorphins to relieve the pain but caffeine doesn't cause pain. I am curious now, gonna have to give this more thought when I have time.