It isn't a fact though. You believe that it's a fact because:
(a)you are thick- headed
(b)it's what you've been told is the truth
(c)it's what you want to believe
(d)you've rationalised the subject (as i have) however you came to a different conclusion to me, which is fine.
i don't understand why you're all so upset simply because i have a different opinion to you...
An illness is a state of disease or sickness.
Basically it's a period where you are not healthy.
Having a loveual preference to the same love isn't unhealthy in any way.
The thick-headed person would be the one who can't take the time in front of a computer to look up what an illness actually is.
And no one is upset that you're an idiot.