A religious argument:
"My lover and I are in a monogamous relationship, and we truly love each other. That can't be wrong!"

This argument is misleading in that it assumes love sanctifies a relationship. It is hard these days to say love is not the final standard for right and wrong. Love is nice, after all; In our culture, it has been nearly deified as something so intense ans beautiful, it justifies almost anything done in its name. Love, in and of itself, does not make a relationship right. In fact, contrary to the touchy-feeling wisdom of this times, love is not always such a good thing.

Love can, according to Jesus, interfere with GOd's plan for an individual. He warns His followers that love for anyone, no matter how legitimate the relationship, becomes sin when it surpasses our love for Him (Matt 10:37). King Solomon, in a similar vein, loved his foreign wives. Problem was, they turned his heart away from GOd (1 kings11:3-4) In his case, love became a snare. Love is not enough to justify a relationship..Two men or two woman may be in love, pledging fidelity to each other and live as happily as any married heterosexual couple, but again, that will not, of itself, justify a homosexual relationship. Scriptures places boundaries on human relationships, offering no compromise, even if love is present and desires to cross those boundaries. If a form of sexual relating is wrong, it remains wrong no mater what degree of love goes along with it.