He's tall, athletically fit, strong and rugged.
He's no scholar but that doesn't make him stupid.
Jack likes ladies, lots of ladies, not keen on men
His word is his bond, if he makes a promise he will keep it, but he'll do his best not to make any promises.
If Jack had a theme tune......this would be it. https://www.youtube.com/watch?v=AXo28e30SKc