This is the 451st most frequent Spanish word.
sexual
Relating to or involving sex or the sexes.
Here, 'sexual' is used as an adjective modifying 'educación' (education), describing the topic of the education.
La educación sexual es esencial en las escuelas.
Sexual education is essential in schools.
In this context, 'sexual' serves as an adjective describing the type of behavior, focused on reproductive or related actions.
El comportamiento sexual de algunos animales es fascinante.
The sexual behavior of some animals is fascinating.
'Sexual' qualifies 'orientación' (orientation), referring to preferences or identities related to attraction.