To answer your questions, I guess it would help if you clarify what you mean by "aggression". Pitbulls are prone to dog aggression but I would say it affects males and females both. This trait is exhibited in all terrier breeds.
A properly raised, well socialized, properly bred Pitbull shouldn't show aggression towards humans but I would say the same about any breed of dog.
Pitbulls range from very busy, driven and active to complete couch potatoes. In her younger days, I'm sure my Pitbull was quite a spitfire in terms of her energy level. In comparison, my current foster is only a grade or two above a slug as far as energy level is concerned.
If you can accept the potential for future dog aggression and be willing to manage it, and you're looking for a dog who will devote himself to you entirely, than this might be the dog for you.
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