Sperm donations. I’ve met quite a few women who made good money from egg donations after getting genetically screened. Nothing wrong with this in my opinion. The sperm or eggs often goes to those partners who can’t conceive on both sides. And the donstors get paid and are screened for recessive diseases.
I had a classmate who made the paper for siring 27 via surrogacy (point of the article being the recipients were in a small geographic area and shocked to discover the fact). Having not heard of him for 15 odd years it was a bit of a surprise when I recognised his face…
He wasn’t the most go-getting individual in school but it seems he’s outdone the rest of us by at least one measure.