I found the egg claim interesting so I gave it a quick search: looks like there may be cases where these eggs can be replaced (https://www.nationalgeographic.co

I found the egg claim interesting so I gave it a quick search: looks like there may be cases where these eggs can be replaced (https://www.nationalgeographic.com/news/2012/3/120229-women-health-ovaries-eggs-reproduction-science/ https://www.nationalgeographic.com/news/2012/3/120229-women-...) but your claim does generally hold true. Wow! It gave me a weird feeling thinking that men would be procreating directly in a sense with their partner's mother.