Then they dont have a right to indulge in lewd behaviour in public which hurts the sensibilities of many families,which is punishable by IPC.
If they want to do it they can do it in private.
Sec. 43.22. OBSCENE DISPLAY OR DISTRIBUTION. (a) A person commits an offense if he intentionally or knowingly displays or distributes an obscene photograph, drawing, or similar visual representation or other obscene material and
is reckless about whether a person is present who will be offended or alarmed by the display or distribution.
(b) An offense under this section is a Class C misdemeanor.
Acts 1973, 63rd Leg., p. 883, ch. 399, Sec. 1, eff. Jan. 1, 1974. Amended by Acts 1993, 73rd Leg., ch. 900, Sec. 1.01, eff. Sept. 1, 1994.
PENAL CODE CHAPTER 43. PUBLIC INDECENCY