My tortoiseshell cat constantly hisses, growls and literally will attact my Dad. She seems to not like men whatsoever. She is fine with me although at times she does bite me but it's more play biting. She doesn't let me pet her for more than a minute before she starts biting. The odd thing is she gives me kisses on demand. Everytime my father walks into my room she goes into attack mode towards him - same if she goes near him. Sometimes she bites him so hard he bleeds. I don't know why she has this extra aggression towards men or an aggression in general. Does anyone have any suggestions on why this might be or a way to calm her down? Do you think the Feliway Difusser will work?