I have 3, 2 females one Male all unrelated but from the same breeder. All 3 are within a few weeks of age and are about 3 years old. The Male is the most docile however none of them are aggressive or defensive, the two females just have an absolutely stupid feeding response that makes them a handful. All 3 are about 48" long.
In my opinion the attitude is more of an individual thing and unrelated to gender. Size also is unrelated to gender. In the wild it is dependent on local however in the U.S. there are no pure locality specific bloodlines so here at least that is not a factor.
Hope this helps.
Joe