One aspect of Senator Santorum's recent remarks, little noted outside the blogsphere, was the way he equated homosexuality with "man on dog" sex. A lot of liberals object to equating them. And so, in 1973, did the Texas legislature:

Section 21.06 of the Texas Penal Code ... criminalizes "deviate sexual intercourse with another individual of the same sex." Deviate sexual intercourse is specified as "any contact between any part of the genitals of one person and the mouth or anus of another person; or... the penetration of the genitals or the anus of another person with an object," meaning that in Texas--as well as Oklahoma, Kansas, and Missouri, which have similar statutes--adult males are legally forbidden to place their mouths on the genitals of other adult males, adult women are legally forbidden to touch other adult women's vaginas, and adults of both sexes are legally forbidden to welcome anything into their anuses if said anything is being maneuvered by a member of the same sex.

However, if the maneuvering (or touching or mouth-placing) is done by a member of the opposite sex, Texas offers its implicit approval, having narrowed its sodomy laws to apply exclusively to same-sex sex in 1973--the same year Texas repealed its laws against bestiality. [NB -- emphasis added]

So the lege apparently made a deliberate, conscious choice to keep homosexual sex illegal, while at the same time removing the obsolete prudery which was keeping men from expressing wholesome romantic affection towards their dogs.

Via Vaara.