In my civie life, I roleplayed with a long term relationship where he wanted me to call him "Daddy" once in a while (not all the time). He was not a pedophile - he liked the nurturing aspect of it. To me, it is a safe way to explore things we would never really do in real life. Hell, I loved the feeling of being taken care of by a caring man.
I've learn not to judge people's kinks as we all have them (even the people who 'claim" to be vanilla). That being said, there are some kinks or fetishes that I will never entertain as I don't like them and feel that they wouldn't being getting the best bang for their buck.
BTW - I would never call anyone "Daddy" without them asking me - hell I am mid-40's.