Sister Sin's Liv Jagrell has just added a new chapter to an eternal discussion. The frontwoman is featured in the latest issue of Penthouse magazine, and although Jagrell doesn't appear nude, the Penthouse spread will absolutely catch the eye and bring attention to Sister Sin.

Female musicians within the rock and metal scene share a host of opinions on using sex to sell  and promote music. Vocalists like In This Moment's Maria Brink and Huntress' Jill Janus embrace their sexuality as part of their musical identities, whereas musicians such as former Arch Enemy singer Angela Gossow and Agoraphobic Nosebleed's Kat Katz have both aired disapproval for the promotional tactic.

Penthouse is certainly excited about getting Liv Jagrell between their pages. "Liv Jagrell of Sweden’s Sister Sin has powerful pipes, a hot body, and can definitely kick your ass," Penthouse writes. "With the band’s fifth album, 'Black Lotus,' and a fall European tour under her belt, she’s poised to dominate the U.S. heavy-metal scene … Jagrell’s voice transcends most modern metal singers, invoking more the classic, soaring sound of Judas Priest’s Rob Halford or maybe even Iron Maiden’s Bruce Dickinson. When she’s not recording or on the road, her 'day job' is just as metal—she’s a personal trainer who can kick your ass and make you do squats till you puke."

Jagrell spoke about the decision to pose for Penthouse in an interview with Decibel. "Our label, Victory Records, has a very good relationship with Penthouse—they do a lot of interviews with Victory’s bands in the music section," Jagrell says. "So, they asked Victory which artists are releasing an album soon. Victory told them about Sister Sin and that the singer is female. That’s how Victory got interested. I think Penthouse would’ve done just an interview like they did with the other bands, but they asked me to do some pictures that would be just for Penthouse instead of using older band pictures. But from the beginning, I said it would have to be classy. And the interview is about Sister Sin, not me personally. So, it’s classy pictures that I could put up anywhere."

Take a look at Jagrell's "classy" Penthouse shoot in the picture above. For more, grab the latest issue of Penthouse.