This mean that it goes beyond just the biological

This
therefore relates to Karl Marx’s theory of “Commodity Fetishism”, where natural
things are changed from their original purpose to other things which transcend
this purpose (Marx, 1867). Once they are given monetary value, the object
becomes a product: thus a process of fetishisation occurs as consumers come to
believe this thing now has intrinsic value.  Applying this theory to the act of sex, would
mean that it goes beyond just the biological purpose. Instead it is turned into
a commodity, where it can be mass produced, purchased and consumed: just like
what happens with pornography.