Adult and Lascivious

Adult adjective - Dealing in or with explicitly sexual material.

Lascivious and adult are semantically related. In some cases you can use "Lascivious" instead an adjective "Adult".

Lascivious adjective - Depicting or referring to sexual matters in a way that is unacceptable in polite society.

Adult and lascivious are semantically related. Sometimes you can use "Adult" instead an adjective "Lascivious".