Chapter 265 of the General Laws is hereby amended by adding the following section:-

Section 60. (a) In any prosecution for an offense under this chapter, a defendant is not justified in using force against another based on the discovery of, knowledge or belief about, or the potential disclosure of the victim’s actual or perceived sex, sexual orientation, gender, gender identity, gender expression, or sex assigned at birth, including, but not limited to, under circumstances in which the victim made a nonviolent romantic or sexual advance toward the defendant or in which the defendant and the victim dated or had a romantic or sexual relationship.

(b) In any prosecution for an offense under this chapter, for the purposes of determining sudden transport of passion, heat of blood, sudden combat or other similar, asserted mitigating factor, any alleged provocation of the defendant by the victim is not objectively reasonable if it is based on the discovery of, knowledge or belief about, or the potential disclosure of the victim’s actual or perceived sex, sexual orientation, gender, gender identity, gender expression, or sex assigned at birth, including, but not limited to, under circumstances in which the victim made a nonviolent romantic or sexual advance toward the defendant or in which the defendant and the victim dated or had a romantic or sexual relationship.

(c) In any prosecution for an offense under this chapter, a defendant does not suffer from a mental impairment affecting or impacting the defendant’s mental state relating to any questions of intent or knowledge based on the discovery of, knowledge or belief about, or the potential disclosure of the victim’s actual or perceived sex, sexual orientation, gender, gender identity, gender expression, or sex assigned at birth, including, but not limited to, under circumstances in which the victim made a nonviolent romantic or sexual advance toward the defendant or in which the defendant and the victim dated or had a romantic or sexual relationship.

(d) In any prosecution for an offense under this chapter, if the defendant offers evidence of the defendant’s discovery of the victim’s actual or perceived sex, sexual orientation, gender, gender identity, gender expression or sex assigned at birth, the court shall instruct the jury to disregard biases or prejudices regarding a person’s actual or perceived sex, sexual orientation, gender, gender identity, gender expression or sex assigned at birth in reaching a verdict.

(e) Notwithstanding the prohibitions in subsections (a) through (c), a court may admit evidence, in accordance with Massachusetts law, of prior trauma to the defendant for the purpose of excusing or justifying the conduct of the defendant or mitigating the severity of an offense.