PPL is a derivative word in a narrow sense, which means that both lesbians are feminine in appearance, and L refers to the first letter of the word "love". PPL often appears as a synonym for les literary works or in the language required by lesbians to make friends.

Homosexuality, also known as same-sex love, is a kind of sexual orientation, which refers to people who have only love and sexual desire for the same sex. Individuals with this sexual orientation are called homosexuals. Homosexuality is also common in other animals except human beings, but it is not the same as human homosexuality based on advanced emotions, which is also a concrete manifestation of the diversified development of human beings.