Quotation do Kapłańska 19:29

It is from the roots of the commandment [that it is] to distance our holy nation from matters of sexual immorality and any matter and any angle whatsoever that contains a stumbling block towards it - as the matter that they, may their memory be blessed, said metaphorically (Sanhedrin 106a) that our God hates promiscuity. [This] means to say, that in His love for us, He distanced us from promiscuity, which is an exceedingly ugly thing, [and which] takes the heart of a man and pushes it off from the good path and from desirable thoughts, to a bad path and thoughts of stupidity. And there is no doubt that if the clothes of men and women were the same, they would constantly mix - these with those - 'and the world would be filled with promiscuity.' And they also said in explaining this commandment that it is to distance all matters of idolatry, as the way of the worshipers of idolatry was with this. And I found these two reasons in the books of Rambam (Sefer HaMitzvot LaRambam, Mitzvot Lo Taase 40; Guide for the Perplexed 3:37) after I wrote them.