He decided to undergo sex change surgery.

This compound has high hydrophilicity, so it mixes very well with water.

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

She was sold as a sex slave in the past.

His sociability is an important factor for his success as a leader.

He is suffering from acquired immunodeficiency syndrome.

Owls are nocturnal animals, they are active at night.

He has lived without going against the fate that was decided by his birth.

He is an intersex person, possessing both male and female gender characteristics.

She enjoys her sex life using a sex toy.