If the legislature want it to apply to heterosexual as well, they would of mention heterosexual acts in the definition. Homosexual acts cannot be excluded and substituted for heterosexual acts. If you are reading that way, you are not reading correct.

A porn can have heterosexual acts. When include is used, it is a partial list.
A porn includes homosexual acts may not necessary exclude heterosexual acts.

If there is no homosexual act in the porn, then it is incorrect and a lie that the porn includes homosexual acts.