In India, prostitution (the exchange of sexual services for money) is legal, but a number of related activities, including soliciting in a public place, kerb crawling, owning or managing a brothel, prostitution in a hotel, child prostitution, pimping and pandering, are crimes. Prostitution is legal only if carried out in private residence of a prostitute or others.
A client is guilty of consorting with prostitutes and can be charged if he engages in sex acts with a sex worker within 200 yards of a public place or "notified area". (Imprisonment of up to 3 months).
However he canot be charged for it at a later stage when he is not found to be indulged at the time of arrest or for an incident that took place earlier.
He can be booked only if he was found to be indulging in it at the time of raid of a brothel.
Therefore let him not be worried about his friend's father's statements which makes no sense.
He cannot do anything for an event that took place long back even if he is having influence with police or with anyone.