Texas Penal Code - PENAL § 22.06. Consent as Defense to Assaultive Conduct

(a) The victim's effective consent or the actor's reasonable belief that the victim consented to the actor's conduct is a defense to prosecution under Section 22.01 (Assault), 22.02 (Aggravated Assault), or 22.05 (Deadly Conduct) if:

(b) The defense to prosecution provided by Subsection (a) is not available to a defendant who commits an offense described by Subsection (a) as a condition of the defendant's or the victim's initiation or continued membership in a criminal street gang, as defined by Section 71.01.