What do you mean in today's society? The question implies that sex wasn't so prevalent before... In the year 1313 an author by name Giovanni Bocaccio wrote 'The Decameron', a twisted tale of seduction and intricate web of sexual attractions. Bocaccio is still a brand name among alternative lifestyles.
In 1740, a noble man by name Marquis de Sade was born. He later was sent to a mental hospital, or a prison due to his aberrant writings and novels. Check out a movie entitled "Quills"
In the Old Testament, Moses advises his country of all possible and prohibited sexual deviations. Mother shall not be with son, uncle shall not be with niece, etc... If he had to say it, chances are they were doing it.
Julius Caesar BCE 12-24, was said to have sex with his sister.
Check a blog on the matter http://sexandhistory.blogspot.com/
Greek philosopher Socrates (469-399) was said to be attracted to boys, homosexuality is in fact not new, it is as old as prostitution. http://www.livius.org/ho-hz/homosexuality/homosexu...
Prostitution was initially a sacred part of the temple services. In some ancient religions, sex was practiced for religious purposes, that is still going on today.
Each year, close to 3000 priests renounce their religious vows in order to marry. Never mind pederasts that still today preach in Church.
What is unhealthy about sex? Maybe the unhealthy is the mind set we have set upon sex. Our polluted thoughts. Just like money is no problem by itself, when you add greed, then is a problem.
There are no coincidences, there has to be a good reason why we were created in such a way that sex is difficult to strip away.
I wrote a related hub: http://hubpages.com/family/My-daughter-saw-me-havi...
It has always been the same. "Nothing new under the sun". Killing, Sex, Corruption, Revolts, Superstition, announcing End of Worlds... all cyclical and the same. It's our turn in the merry go round, that's all.