The professor behind a controversial and heavily criticized gay parenting study is back in the headlines, this time with some eyebrow-raising claims about same-sex marriage.

In a clip provided by Good As You's Jeremy Hooper, Professor Mark Regnerus of the University of Texas at Austin claims that straight men will feel compelled to demand open relationships, as well as anal sex, from their wives and girlfriends.

"If gay marriage is perceived as legitimate by heterosexual women, it will eventually embolden boyfriends everywhere, and not a few husbands, to press for what men have always historically wanted but were rarely allowed: sexual novelty in the form of permission to stray without jeopardizing their primary relationship," Regnerus says in the clip, which can be heard below:

In addition, he claims the "normalization of gay men's sexual behavior" in society will prompt a surge in the "practice of heterosexual anal sex."

The new claims come on the heels of a wave of criticism targeting Regnerus' 2012 parenting study, which raised doubts over the suitability of same-sex parents.

Darren E. Sherkat, a professor of sociology at Southern Illinois University at Carbondale, called Regnerus' findings "bullsh*t," noting that the paper's loose definition of "lesbian mothers" and “gay fathers” should have “disqualified it immediately,” according to The Chronicle of Higher Education.

The American Medical Association and the President of the American Sociological Association have also put their names to documents which called Regnerus’ methodology scientifically unsound, according to The New Civil Rights Movement.