A man doesn't necessarily have to be sleeping around with others, but can be sexually demanding, and even sexually abusive to his significant other. Sex dominates every day of his relationships. Irresponsible, and inappropriate behaviors are common. Self induced thoughts of indiscretions from his significant other, and acting upon those self induced thoughts, against a partners will.
A man that gives into all his issues whether they are dangerous to him, or others, and either see's no issues with the behavior, or does see the issues, but refuses to acknowledge his weakness's and seek help.
A man who will have sex with anything that moves.
Someone who will have sex with anything, or/ and anyone without thought of consequence. And because this man thinks, breathes, and see things in that way, they are considered a Neanderthal Dog. A unfeeling, unthinking, non-understanding, non-caring individual, who will "rut" with anything that moves...thus a dog. Neanderthal Dog.