Creating fictional worlds also means populating them - but how does the population keep populating? At some point you're good to have to look at your setting and ask, bluntly, just how sex works for the people and creatures you created. This can be incredibly complicated in our own world, let alone a newly imagined setting!
This book is a helpful series of 50 questions, as well as follow-up exercises and more, to help you think about sex in your setting. From mental development to social diseases, the definition of maturity to the role of senses in reproduction, there's plenty of questions to get you to think. It's having a worldbuilding coach in one handy guide!
So it's time to talk about sex and the worlds you make!