As the Lord of Fertility, you can command your workaholic Nymphs to do your bidding based on the 3 categories they specialize in: Harvester, Worker and Fighter.
Every action they make consumes their limited amount of Stamina, whether it's harvesting, working on eco-dildos or fighting evil Golems that pollute the lands. Once their Stamina is depleted, they will be too exhausted to respond to your commands, so make sure you plan their actions carefully.