What does this sentence mean? Women are like pears and men are like onions. So I can't understand. Give 10 points.

Women are like pears. People who eat pears don't know that their hearts are sour, because they are thrown away in the end, so men will never understand women's hearts. Men are like onions. If you want to see a man's heart, you need to peel it off layer by layer! But in the process of peeling, you will cry all the time. At the end of peeling, you will know that onions are heartless.