A contemporary poet and philosopher from my country considered eroticism the key to what he calls "ecological asceticism": physical intimacy and tenderness requires "no more energy than digging in your planting bed", but it forces us to attune to another person, another human being.
This is probably the main reason I fear that people who give up having children or (rather) long-term relationships to "save the planet" are digging a hole for themselves. I mean... isn't this a bit too tough, brutal even? Only a handful of us probably really succeed in not being a social animal. Or, not requiring any meaningful physical closeness.