I understand your concern towards your friend. He might even be suffering from social anxiety issues as well. However more clarity is needed regarding his actual problem. I would be more than happy to help you with that. My clinic is at OMR chennai. Some therapy sessions and if needed medical help might be useful for him. For further information you can directly consult with me through Practo. Online chat consultation is also available.

What I have seen more often in my practice is that such persons have sexual obsessions. He needs to be evaluated by a Psychiatrist for proper diagnosis and treatment.