How common is inter-sibling incest in today's society? Since sex is no longer practised for procreation but more for recreation and mutual physical enjoyment, what is your opinion regarding consensual sex between siblings, with the understanding that effective contraceptives to prevent unwanted pregnancies are used, and that it is done in privacy?
Interesting enough incest has been delegalized in France by Napoleon 200 years ago. Likewise, it is not illegal in the Netherlands (although some intra-family sex with minors is punishable by law). In many countries sex between first cousins is likewise quite accepted (mostly in countries where Anglo-Saxon law applies).
Incest was not always illegal. In the UK it had once been an offence punishable only by the ecclesiastical courts. But the authority of these courts had been greatly weakened at the time of the Reformation, and was more or less abolished after 1641. For very nearly the next 270 years, incestuous unions remained subject to various legal and customary disadvantages, but were not against the law until the Punishment of Incest Act was passed in 1908, which criminalised such behaviour between consenting adults for the first time - a mere century ago! The Act was fiercely opposed and was finally only accepted by a narrow margin after inter-cousin marriages (and thus inter-cousin sex) was legalised.
What is your opinion? Gross? Maybe? Yes? Done it?