1. Sex can be essentially a material phenomenon. There is no need to posit anything beyond natural urges to explain our psychological condition.
2. From the fact that sexuality begins so early, there is a strong likelihood that it will have an enormous effect on our lives.
3. There is a strength to sexuality. In sexual matters we do not readily tolerate frustration.
4. Sexuality is plastic -- many aspects of our lives can become sexualized. For instance, our thinking is sexualized. Our curiosity begins by asking questions about how babies are born, and what differentiates the sexes. Thinking can fall victim to the same repression that happens in infant sexuality. Curiosity can remain inhibited, especially in connection with religion.