Important philosophical question settled - Why Men and Women Can't Be Friends.
Disclaimer: This is on a college campus. All the people they talked to were young, decent-to-good looking and appeared to be heterosexual. So that leaves the question open still regarding not so good-looking people, LGBT stuff that I have literally no clue about, and anything else that I haven't thought of - I'm guessing length/type of exposure to the other person and/or other factors such as age and general social environment (hypothetical: attraction overload situation). Still funny.