That sentence comes from a Huffington Post article on a mother-daughter porn team, the Sexxxtons. It is explained that:
For the most part, the Sexxxtons only have sex in the same room when on camera, but Jessica said they did do a threesome with one of her boyfriends one night. “We were talking about sex and it happened. We all had a good time,” she said.
Mercifully, that’s not likely to happen. An adult-film historian predicts: “The adult industry is not that stupid. . . . They have enough problems without creating on-camera incest.”
All in the name of journalism, the Huffington Post assures that they did background research on the duo:
In order to confirm the Sexxxtons are really related and not just claiming that as a marketing gimmick, The Huffington Post reviewed both women’s driver’s licenses, and their private Facebook pages, as well as private family photos going back 20 years.
I do have to give the HuffPo credit though, unlike the Daily Mail they did not post salacious photos.