The research team studied the safety and mechanics of various sex machines to improve design standards.

Biologists studied the development of sex organs in several species.

Researchers studied how social media affects people's sex lives across different age groups.

They always practice protected sex to reduce the risk of STIs and unintended pregnancy.

The protesters argued that advertising often reduces women to sex objects.

Humanitarian workers rescued several sex slaves from the trafficking ring and provided them with medical and psychological support.

The children engaged in sex play during recess.

Many couples attend workshops to learn about different sex positions that improve comfort and intimacy.

She realized that people of the opposite sex often face different social expectations.

After the health workshop, many students were more comfortable discussing condom use and other strategies for safer sex.