I get it now

Sell some eggs at winter so you can afford a great vacation at summer.

It's because women are born with a limited amount of eggs but guys can reproduce once they hit puberty and rarely get any reproduction ends like how women get menopause and the sperm just constantly get remade like normal cells ( but not as fast)

Yeah who wants to buy my uterus ???

You mean i could make money and have fewer periods too? Sounds like a dream cone true

You never use up all your eggs anyway