食色性也（孔子）。

Desire for food and sex is part of human nature.

Source: Tatoeba

Sentence Composition

1 食色性也 shísèxìngyě
  1. Appetite and lust are only natural (Mencius 6A:4).
  2. By nature we desire food and sex.
2 孔子 Kǒngzǐ Confucius (551-479 BC), Chinese thinker and social philosopher, also known as 孔夫子 Kǒngfūzǐ