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Teen Mom’s Amber: My Biggest Sex Mistake Ever

They know from experience!

Related: PHOTOS: Teen mom's original cast

Teen Mom's Amber Portwood and Catelynn Lowell are setting the record straight when it comes to truly safe sex.

Related: PHOTOS: Teen Mom 2's tots

Both Portwood, 20, and Lowell, 19 famously chronicled their unplanned pregnancies on the first season of MTV's hit. Portwood and her on-and-off beau Gary Shirley gave birth to their daughter Leah Leann in November 2008. and have struggled to provide a stable home. Lowell and her boyfriend, Tyler Baltierra, welcomed their daughter Carolyn "Carly" Elizabeth in May 2009; the young parents decided to put their daughter up for adoption and later struggle with that choice.

Related: PHOTOS: Stars who've adopted

In a new MTV special Top 10 Most Outrageous Sex Myths airing Tuesday at 8:30 p.m., the duo get brutally honest about a sex myth no one should believe.

Watch the clip now.

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