Take that to the bank...
Wow, there is this guy who was a very prolific sperm donor for the (supposed) #1 sperm bank in the nation in the late 80s and 90s. His wife was infertile and he wanted to "live on in the gene pool" or something like that so he really got busy donating sperm. Every week for years. When he stopped donating he left a letter saying any kids he fathered could contact him. Read
the article, interesting story.
Sperm Whale: