Education about sex is very important.

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

His nature is very kind.

Detailed information is needed to understand the nature of that project.

I was moved by his sincerity.

His nature is very kind.

Gender identity refers to the gender that each individual recognizes themselves as.

He solved the problem in a scientific way.

He loves science classes.

He is facing many difficulties due to gender identity disorder.