The Church is practicing deliberate ignorance because were they to accept the scientific reality, they would have to recognize gay sexuality as homo-normative and perform gay marriage. Curial sexual dogma is junk religion. Most of the promoters of it in the Church are themselves sexually abberant, having the asexual orientation. If they had any self-awareness they would realize that they were the diffferernt ones whose experience of sexualtiy is not the same as the people they pontification about, both gay and straight. Telling someone who is gay that they must behave as hetero is moral torture for both the gay person and anyone unlucky enough to marry one. If you assume that God is not an ogre and wants people to express their sexuality in ways that are normal for them, there is no reason for the Church’s current teaching except pietousness. It certainly is not pleasing to God to torture gays. If you fear Hell, you should not promote it.