I chose a female, and she humps her soft toys! She marks too....
I don't think it's true that females bond better with men, and vice versa, because my Milly doesn't ever leave my side, and my friends say they've never seen a dog more devoted to its human
Perhaps if I lived with a man she might have migrated more towards him, but as it's just me, we have developed an incredibly close bond.
I did read that female Yorkies tend to be the more watchful (and therefore the more vocal) sex, and this is possibly true. My little girl thinks she is a guard puppy!