Just a little over a week after it said white girls were forbidden to wear Princess Moana costumes for Halloween, Cosmo managed to out-ridiculous itself by normalizing incest.

If you think Cosmo couldn’t top its already off-the-charts insanity, then brace yourself, because things are going to get really gross . . . even by Cosmo standards.

The recent article titled “This Is What It’s Like to Fall In Love With Your Brother,” profiles the haunting tale of Melissa, who did not know she had a brother for 40 years until just recently. To make a long story short, when Melissa met her long-lost brother, named Brian, she felt immediate attraction to him and the two had sex after just one drink, even though both were married at the time.

Melissa maintains that she and her husband maintain an open relationship; Brian has since left his wife. Eventually, the two hope they can move in with each other and marry.

Cosmo gives no moral objection to this depraved behavior and even passes it off with a scientific term called "genetic sexual attraction."

There must be some natural explanation for these feelings, Brian remembers thinking. And according to them, there is. The half-siblings say they are prime examples of genetic sexual attraction (GSA). The term was coined by Barbara Gonyo in the 1980s after she experienced an attraction to the adult son she had placed for adoption as an infant. (She later started a support group for other families.)

While the American Psychological Association does not use the term, GSA is what it sounds like: a phenomenon that occurs when two family members, who were separated early in life, eventually meet and experience an intense sexual attraction to each other — though not all act on it.

Psychologist Debra Lieberman says that this "genetic sexual attraction" typically happens among siblings who go a long time without seeing each other.

But it’s been suggested that this feeling is even stronger for consanguineous (aka related) couples, especially those who don’t develop the ick factor from growing up together. Why? “Genes tend to shape our preferences, talents, and attitudes — and familiarity creates comfort, so we look for someone similar,” Lieberman says. “For siblings, this drives an enhanced sexual attraction.” Which is exactly what happened to Melissa and Brian.

The only negative mention from Cosmo in an otherwise sympathetic portrayal of Melissa and her brother Brian is that it's bad for the passing on of genes. Indeed, inbreeding dramatically increases the likelihood that the offspring will have severe abnormalities.