He is a famous author and a person who is respected by many people.

He spends a lot of time studying.

He reads a lot of books.

He decided to accept her proposal.

Sexology is the scientific study of human sexual behavior and sexuality.

He is a world-famous scientist.

This theory is accepted by many scientists because of its universality.

Education about sex is very important.

Einstein proposed the theory of relativity.

He is good at explaining that theory.