In the armed forces, we try to segregate by sex, to avoid too intimate contact between the sexes. The rationale for antagonism to open homosexuality is the same. Attraction is not always rational. I have had too many guys hit on me despite "knowing" that I was heterosexual, because they had rationalized their attraction, to be sanguine that it would not be disruptive.
Sexual norms are a product of society, but grounded in nature. Waiting later to marry off women is preferable, but I can say that because of observations about relative maturity at various ages. In other words, drawing from nature, I see the change as an improvement.
The main issue is not reproduction, but apparent fittingness, which happens to include reproduction. Nature matters only insofar as it seems to reflect on the apparent order of things. In the case of celibacy, nature is sacrificed to supernatural goals. In the case of sterility, it depends upon how, when, and why. In any case, it is not a matter of simple "naturalism", but of fulfilling the needs of man as a rational and social animal, concerned with the good order of society. |