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

He decided to accept her proposal.

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

He spends a lot of time studying.

He reads a lot of books.

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

He is a world-famous scientist.

Education about sex is very important.

Einstein proposed the theory of relativity.

He is good at explaining that theory.