Well, the argument for alternatives to heterosexuality, including celibacy can be made on the grounds that heterosexuality is destroying the earth's ecosystem, due to overpopulation.
Overabundance of human beings is depleting the oceans of fish, and causing pollution on a massive scale. We are, quite literally destroying the planet because there are too many of us.
Many animal and plant species are becoming extinct, in order to make room for an increasing number of humans.
So being celibate or practicing other forms of sexuality would be a good idea for the long-term health of the planet.
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