I have a thing for males. They are usually (in my opinion and observations) a bit more goofy and cuddly and I really like that.

I have actually never seen a male dog mark in an agility course. I show my Aunt's male Lab Robert in agility (*does happy dance*, I get to show him in another trial, New year's eve weekend...soo happy ) and he is a huge marker, has to mark everything...but in the ring he has never done anything like that, he is way more concentrated on other things.