A person who has a crush on you who you must avoid or ignore to prevent him or her from thinking your are interested.
Also, a situation where a person would find him or herself the center of unwanted sexual or amorous attention.
"Man, that ugly girl, Katrina, has been crushing on me for months. I'm trying to stay away from her because she's an infatuation risk."
"Don't bring your hot straight guy friends to a gaybar. That's an infatuation risk."