It is necessary to distinguish between those things which are not natural, that is, not originating in nature, and those things which are contrary to nature. To perfect nature is not a bad thing: the fundamental dogmas of Christianity (the Trinity, the Incarnation etc.) are not knowable by reason alone, and are therefore not natural. A/C, internet and the like are simiarly to our human nature.
Homosexuality, and even worse, those criminal and sacriligious unions called “marriages” by many, are directly contrary to nature, since the sexual organs were created by God for the purpose of reproduction, to which union with same-sex absolutely prohibits. Similarly with same-sex marriage.
So, there things which assist nature, and which add to it, but do not contravene nature, and there are thigns which frustrate nature, and homosexual conduct and the pseudomarriage contracted between two persons of the same-sex, is among the latter.
Benedicat Deus,
Latinitas