Re: Need some advice
Just my opinion - I wouldn't automatically jump to sexual disorders to sex addiction. The reason is because you are telling us that he is 54 years old and based on your post, you seemed to be surprised by this behavior, which would indicate that this is relatively new. It would be VERY unusual for someone to be a sexual addict or have some other type of paraphilia and the family would not have seen any evidence of this before he was 54 years old. If you dad is only showing these behaviors now at 54, something has to have happened recently for this to change. It would be unlikely that someone would develop this at this point in life and never have shown unusual behavior like this before. This is just how mental illness works. Most people do not live a normal life with normal mental health and then suddenly at 54 develop a severe mental illness like a parapilia disorder. Behaviors like these in an adult take a lifetime to develop. Now, if there is some history that you have not yet shared, that might change my opinion, but at this time I would not look first to a sexual addiction.
SO, that leads us to look to see if there could be some other explanations. Sometimes when people begin to have cognitive decline or dementia, they start to loose the ability to understand that these things are not socially appropriate. If you look at people who have had brain injuries in specific parts of their brain, they occasionally show this total lack of filter about social appropriateness - sometimes with sexual issues. My first suspicion would actually be that your dad has had a stroke (or a series of small strokes) or has some other type of progressing dementia or other brain disease.
If it were me, I would get my dad to a hospital or doctor ASAP and get him scheduled for a neurological assessment and a brain scan, hopefully a CAT scan and an MRI. If you live hear a large teaching hospital (such as one associated with a university).
Hope this helps