Sec. 1. (a) Subsection (b) applies to a proceeding in the prosecution of a defendant for an offense, or an attempt or conspiracy to commit an offense, under the following provisions of the Penal Code:
(1) if committed against a child under 17 years of age:
(A) Chapter 21 (Sexual Offenses);
(B) Chapter 22 (Assaultive Offenses); or
(C) § 25.02 (Prohibited Sexual Conduct); or
(2) if committed against a person younger than 18 years of age:
(A) § 43.25 (Sexual Performance by a Child);
(B) Section 20A.02(a)(5), (6), (7), or (8) (Trafficking of Persons);
(C) Section 20A.03 (Continuous Trafficking of Persons), if based partly or wholly on conduct that constitutes an offense under Section 20A.02(a)(5), (6), (7), or (8); or
(D) § 43.05(a)(2) (Compelling Prostitution).

(b) Notwithstanding Rules 404 and 405, Texas Rules of Evidence, evidence of other crimes, wrongs, or acts committed by the defendant against the child who is the victim of the alleged offense shall be admitted for its bearing on relevant matters, including:
(1) the state of mind of the defendant and the child; and
(2) the previous and subsequent relationship between the defendant and the child.
Sec. 2. (a) Subsection (b) applies only to the trial of a defendant for:
(1) an offense under any of the following provisions of the Penal Code:
(A) Section 20A.02, if punishable as a felony of the first degree under Section 20A.02(b)(1) (Labor or Sex Trafficking of a Child or Disabled Individual);
(B) § 21.02 (Continuous Sexual Abuse of Young Child or Disabled Individual);
(C) § 21.11 (Indecency With a Child);
(D) § 22.011(a)(2) (Sexual Assault of a Child);
(E) Sections 22.021(a)(1)(B) and (2) (Aggravated Sexual Assault of a Child);
(F) § 33.021 (Online Solicitation of a Minor);
(G) § 43.25 (Sexual Performance by a Child); or
(H) § 43.26 (Possession or Promotion of Child Pornography), Penal Code; or
(2) an attempt or conspiracy to commit an offense described by Subdivision (1).
(b) Notwithstanding Rules 404 and 405, Texas Rules of Evidence, and subject to Section 2-a, evidence that the defendant has committed a separate offense described by Subsection (a)(1) or (2) may be admitted in the trial of an alleged offense described by Subsection (a)(1) or (2) for any bearing the evidence has on relevant matters, including the character of the defendant and acts performed in conformity with the character of the defendant.
Sec. 2-a. Before evidence described by Section 2 may be introduced, the trial judge must:
(1) determine that the evidence likely to be admitted at trial will be adequate to support a finding by the jury that the defendant committed the separate offense beyond a reasonable doubt; and
(2) conduct a hearing out of the presence of the jury for that purpose.
Sec. 3. The state shall give the defendant notice of the state’s intent to introduce in the case in chief evidence described by Section 1 or 2 not later than the 30th day before the date of the defendant’s trial.
Sec. 4. This article does not limit the admissibility of evidence of extraneous crimes, wrongs, or acts under any other applicable law.