RENO, Nevada (Wireless Flash) -- A former model for "Playboy" is earning even more fame for her vocals than for her looks.

Heidi Cortez is the voice behind "Tissue Time With Heidi," a show that Howard Stern is programming at Sirius Satellite Radio. The job requires her to have phone sex with callers.

It might be hard for some women, but she says it comes naturally because she's been recording adult phone sex CDs since she was 19.

Cortez hopes the vocal support lasts a long time but talking dirty isn't her only career option. The 25-year-old also owns her own tanning salon in Reno, Nevada.

However, she forbids her raunchy recordings to be played on the premises because, she insists, "we're completely professional.