Got this from reddit. "This Ted talk [“Homosexuality- it’s about survival, not sex”] argued that homosexuality exists as an evolutionary means of birth control (by reducing conflict amongst the males for the females) and that the more sons a mother will have the more likely homosexuality chances will increase for the sons.
How can we still argue that homosexuality is immoral/contrary to the procreative faculties if there is an explicit genetic/evolutionary/biological reason for it?"
PS: It seems as though most, if not all of the people who have replied so far are ignorant of Thomistic ethics and philosophy in general. If you do not have any understanding of Thomism then you might as well not reply. Baseless appeals to the will of God are not sound responses.