It refers to any sexual conduct or performance. 43.25 b and c:
“(b) A person commits an offense if, knowing the character and content thereof, he employs, authorizes, or induces a child younger than 18 years of age to engage in sexual conduct or a sexual performance. A parent or legal guardian or custodian of a child younger than 18 years of age commits an offense if he consents to the participation by the child in a sexual performance.
(c) An offense under Subsection (b) is a felony of the second degree, except that the offense is a felony of the first degree if the victim is younger than 14 years of age at the time the offense is committed, regardless of whether the actor knows the age of the victim at the time of the offense.”
NOTE:
“(2) "Sexual conduct" means sexual contact, actual or simulated sexual intercourse, deviate sexual intercourse, sexual bestiality, masturbation, sado-masochistic abuse, or lewd exhibition of the genitals, the anus, or any portion of the female breast below the top of the areola.”