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Nick & Mariah went on Sirius' Morning Mash Up show this morning where they almost caused listeners to lose their breakfast!

When asked what the secret to their successful marriage is, Nick blurted out "Lots of sex!"

Well, boys and girls, "lots of sex" leads to babies, but Mariah insists she's not preggers...yet.

"I gotta probably go on tour first," Mariah said when asked on how long they'll wait until they start to procreate. But Mariah ain't gettin any younger, and the couple HAS already picked out their baby names -- which she won't reveal because they are so dazzling and special that someone will most likely try to steal them.

Yeah, like Hello Kitty and My Melody will really be the top of the baby name charts in 2010.

Listen to Mariah and Nick on the Morning Mash-Up show here.