Eternal sin
In Catholic teaching there are six sins that blaspheme against the Holy Spirit. They are: Several passages in the Bible are frequently interpreted as referring to the unforgivable sin:
History of the Catholic Church and homosexuality
In the "Summa Theologica", Thomas Aquinas stated that "the unnatural vice" is the greatest of the sins of lust. In his "Summa contra Gentiles", traditionally dated to 1264, he argued against what he called "the error of those who say that there is no more sin in the emission of the semen than in the ejection of other superfluous products from the body" by saying that, after murder, which destroys an existing human being, disordinate emission of semen to the preclusion of generating a human being seems to come second.