When choosing a pet, does the sex of the animal affect your decision?

One thing that I really can’t stand is when a male dog humps someone’s leg. For this reason alone, whenever I’ve considered adopting a new dog I’ve chosen a female – is this a valid enough reason? Can a male dog be easily trained to not hump everything in sight?

(This question is not specific to my reason mentioned above. I’m curious what you take into consideration when choosing the sex of a pet, and why.)