A society that wants to control their people can take one of two opposing views to sex and reproduction. One is to prohibit birth control in order to increase the population, the other is to sanction sex for pleasure vs. reproduction. There are pros and cons to both.
Prohibiting birth control means that the instinctive sex drive results in offspring. Most societies took this approach in known history. Death in childhood, and death by disease or war was more common in the last few thousand years than living in Canada in… is it the 2500th century in Vision Speak, remind me?!?
Increasing the population created more soldiers and farmers - a simple equation that equaled a better chance of survival.
The other approach, beyond our current day acceptance, is hinted at in Vision Speak. Sex is apparently considered a normal and acceptable behavior, even in a public garden. I assume that this advanced society does not have to worry about unplanned pregnancy or STIs?
Sex is a source of endorphins and a natural human drive. Letting a population pursue this without fear of repercussions may act like a tranquilizer. This could be a ‘Brave New World’ style ‘soma’ for the people, to keep them content?