Yet another case in point showing that libertarianism is synonymous with neither classical liberalism nor a firm belief in the US Constitution as a guide for governance of these United States.
Just another utopian philosophy from a century that developed more than a few.
Perhaps before you say that you can point out a libertarian who wants prostitution to be illegal. One such individual would not prove you right, but it might give you some basis for such a charge.
You have flipped the meaning around.
WW sees folks who he thinks(1) want to keep prostitution illegal and wonders how they can call themselves libertarian.
Part of my point is that he is probably right in that libertarian doctrine is incompatible with outlawing consensual sex where money changes hands.
Another part is that the outlawing of such, especially when done by sub-units in a federal system, is NOT incompatible with either classical liberalism or the COTUS.
Furthermore, many folks conflate libertarianism with classical liberalism. This topic is only one of the ways in which they are at odds. I would argue that is due to the nature of the underlying principles of the two philosophies.
Last, the underlying philosophy of classical liberalism (and the COTUS, as its expression) deals more realistically with human nature(2) than does libertarianism, which, in its more anarchic expression, requires more of men than their nature allows (anarcho-capitalism, minarchism, etc.) and in its more authoritarian expressions (dealing with "positive" liberty issues like gay marriage) would use the power of gov't to push aside the COTUS (& state constitutions) and force its conception of liberty on all...whether they want it or not.
(1) Likely incorrect in the cases of some who argue that the legalization of prostitution would have deleterious economic effects.
(2) "If men were angels, no government would be necessary. If angels were to govern men, neither external nor internal controls on government would be necessary. In framing a government which is to be administered by men over men, the great difficulty lies in this: you must first enable the government to control the governed; and in the next place oblige it to control itself."
----Federalist #51