Sex is the most natural thing in the world? Not anymore. Today’s bedrooms are inhabited by some seriously seductive scanties, sex toys and modern contraceptive methods. So our sex lives aren’t as natural as we may think. They can be environmentally harmful too. Admittedly, the impact of human sexuality on the environment is small – aside from producing all the people who pollute it, that is. Laura Spengler, who heads the sustainable consumption division of the German Environment Agency (UBA), says our sexual behaviour plays very little role in the environmental effects of consumption as a whol…