RCW 9A.88.030: Prostitution.

(1) A person age eighteen or older is guilty of prostitution if such person engages or agrees or offers to engage in sexual conduct with another person in return for a fee.

(2) For purposes of this section, "sexual conduct" means "sexual intercourse" or "sexual contact," both as defined in chapter 9A.44 RCW.

(3) Prostitution is a misdemeanor.