
Elon Musk offered his sperm to future Mars colonists to help seed a colony as part of SpaceX's effort to design a Martian colony from scratch. Musk, a self-proclaimed "pro-natalist," is concerned about decreasing birth rates and sees colonizing Mars as a solution to make life multi-planetary.

Elon Musk wants to seed a Mars colony to help establish a permanent human population on the Red Planet and make humanity a multi-planetary species. He believes that decreasing birth rates pose a significant threat to civilization and sees colonizing Mars as a solution to ensure its continuation. Musk's SpaceX is working on designing habitats, spacesuits, and investigating the possibility of human reproduction on Mars.

Musk initially aimed to launch a manned mission to Mars by this year, but the plans did not materialize. Instead, he now expects to settle a million colonists on Mars in the next 20 years, including numerous of his own offspring.