Arren, you seem to like posting arguments, and then when you get answers, you will say,"Ah,but it's not like that!". You always want a "magical" solution, no matter how many members tell you the truth. So get this; there are well over a thousand different species of Flies.Small flies are not baby flies; all flies are born adults.Flies will land on you because you sweat. (It is why you do not see flies very often landing on dogs. Dogs don't sweat!) All flies drink, so will often try to reach you eyes;the moist part of your body. Flies may be a nuisance, but they cannot harm your body. The danger from flies is that they walk on your food and contaminate it.
So, Arren, instead of posting questions about this that and the other, study first! I mean, what have animals obeying you got to do with a site like this?
You can learn all about animals, and flies, from books, or from Google.