Because I don't buy-in to the redefinition of things that the propagandists feed the public through the media.  When we call homosexual sodomy "sex," we are saying it is the same as the act by which the human species is propagated.

The act of sodomy is generally not fit for public discussion, so the homosexualists soft-soaped it by calling it "sex."  No one here likes the term "sodomy," even homosexuals, because it calls attention to the acts that the Church labels as disordered and the general public finds offensive and abhorrent (with the PC caveat, "Not that there's anything wrong with that")

Redefining words and acts is a means of hiding or rationalizing sin.