I accept that there are some who would embrace your ideal of utopia, although I would probably tend to call such a choice of "freedom" by another name, anarchism. I even accept that your support of some one else's choice for anarchism is in some ways admirable. I think that it was Plato who said ...I may not believe in your cause, but I will fight for your right to express it...maybe it was spiderman but I am sure that you get the drift.
You may be right when you state , "it's a fact that many men and women do believe and are only interested in casual sex", however I am not one and furthermore I do not actually know of any. So I guess that I am not part of the "many".