We cannot address the issue without first looking at the motivation to have sex, in this case of a 16 year-old boy or girl.

The reasons for wanting sex are extremely varied (http://psychcentral.com/blog/237-reasons-to-have-sex), but can generally be categorised to come from one of the three lower chakras (energy centres): Muladhara, Svadhisthana and Manipura, broadly motivating for survival, pleasure and control, respectively.

Under survival comes procreation, attempting to perpetuate one's body. Also the hope that partners and/or children/progeny will care for and feed us when old.

Once survival is relatively assured, one turns to enjoy sensual pleasures.

Next, one wishes to improve their social standing and fame, rising up on the pecking order, as perceived by both themselves and others. Sex with appropriate persons can help facilitating this.

A 16 year-old is very unlikely to be helped by a prostitute:

* His/her survival is not going to be enhanced: they will not get a baby, nor physical/financial support (quite the contrary, their parent pays).

* They will get little sensual pleasure because the act will be rushed and mechanical with little warmth, love or comfort - for the prostitute, this is business, unemotional and part of their survival strategy!

* Having sex with a prostitute is not a social achievement: there is no conquest to be proud of and nothing else to show off, after all it was obtained by dad/mom's money rather than by one's own merit.

What a 16 year-old may sometimes obtain by having this sex with a prostitute, though, is to please their parent(s). Yes, one should not abandon the fifth commandment, but such parents must be sick indeed to condition their parental love on sexual "success".