- sexagesimal number system
- sexagesimal system
- sex allocation
- sex allocation theory
- Sex and the City
- sexangle
- sex attractant
- sex chromosome
- sex control
- sexdecillion
- sex determination
- sex determination based on skeleton
- sex-determining region on the Y chromosome gene
- sex differences in rodents
- sex differentiation
- sex distribution
- sexduction
- Sex education for adolescence
- sexenary
- sex film
- sex gland
- sex hormone
- sex hormone binding globulin
- sex hormone therapy
- sex identification