I have read a sentence: women are like eggs. Hard appearance, pure heart, yellow heart. How to understand this sentence

This sentence analyzes women from the surface, inner layer and core point, which means that women look aloof, inaccessible and difficult to control from the outside. In fact, her heart is pure, just like egg white. As for what is in the soul, saying that she is yellow actually means that she also longs for perfect sex, and she often thinks about some shameful things in her heart.

This sentence seems reasonable, but it can't stand scrutiny. Depending on who she is.