Why are dilated pupils seen as more attractive?

I've heard this many times yet I never catch the actual reason why would they be more appealing, especially to men on women?

My eyes are grey and my pupils seem to be dilated a bit more than others'. My friends, family especially my sister has noted this. I do not know why I have them like that. I don't do drugs lol

for comparison
for comparison
not mine but I usually have them dilated this much even in normal daylight (I absolutely hate daylight I must add)
not mine but I usually have them dilated this much even in normal daylight (I absolutely hate daylight I must add)
Why are dilated pupils seen as more attractive?
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