The first step of treating infertility in many cases is to treat the underlying cause of infertility. For example, in cases where thyroid disease causes hormone imbalances, medication for thyroid disease may be able to restore fertility.
The first Dark Lord of the Sith was Ajunta Pall, a fallen Jedi and leader of the Dark Exiles. Ajunta Pall was a former Jedi Master following the First Great Schism who was very much into the teachings of alchemy. He eventually discovered the way to create and shape life, something his successors would attempt to learn themselves for eons.
He was the master of both Anakin Skywalker and Luke Skywalker, and he was the first Jedi in one thousand years to defeat a Sith Lord in one-on-one combat! He fought and defeated Darth Maul, the Sith that killed his master, Qui-Gon Jinn. He was also one of the last members of the High Jedi Council.