Elijah and Milo Peters Gay porn's most shocking taboo "Twincest" is pushing limits in an industry known for extremes. What is it, and why are so many people watching?

Based on their YouTube channel, Elijah and Milo Peters just seem like your average, slightly awkward Czech teenage twins. They enjoy role-playing games and steak. They like frolicking around on the beach in their elaborately patterned underwear and taunting each other while bodybuilding. ("Hey you lazy-ee boy! Put some weight on eet!") But the Peters twins aren't quite as innocent as their goofy grins and adorable accents suggest.

Over the past few months, they have become two of the most controversial performers to hit the gay porn world in a very long time. That's because they're willing to break a taboo that, even in an industry that thrives on extremes, is too extreme for many: twin incest (or, more succinctly, twincest). While the concept of twin performers is not new to the gay porn world, the Peters twins are notable both because of the extent of their popularity and the things they are willing to do with each other on camera. They French kiss; they perform oral sex on each other; they have anal sex; and most shockingly of all, they do it in a tender and romantic way.

"My brother is my boyfriend, and I am his boyfriend," says one of the twins during a phone call from Prague (Elijah and Milo sound so much alike on the phone it is impossible to tell which one is speaking). "He is my lifeblood, and he...