What do you think about me taking my nephew to a prostitute behind his parents' back?
Jeez, why do you want to take your nephew to sex worker?
Because I care for him and I want to help him to improve his personal life.
You shouldn't force a young person into engaging in sexual activity when they might not be ready for it. You should let him find his own way with someone he falls in love with and is his own age.
I'm willing to offer a helping hand to my nephew. Unlike close-minded Puritans like yourself, he'll understand and appreciate why I'm doing it.
Have you even discussed this with him? If he's under 18, you could be arrested for child molestation and contributing to the delinquency of a minor. Going through with this when he might not be ready for it, plus going behind his parents' back, makes it even worse.