Bristol Palin Wants Levi Johnston in Son's Life

05/06/2009 AT 09:10 AM EDT

Bristol Palin promoted sexual abstinence for her fellow teens in dual appearances Wednesday on ABC's Good Morning America and NBC's Today – prompting her interviewers on both shows to question how she can preach something she obviously didn't practice.

While declining to discuss what methods of birth control she might have used, Palin, 18, told GMA's Christopher Cuomo, "Regardless of what I did personally, I just think that abstinence is the only ... 100 percent foolproof way to prevent pregnancy." She also acknowledged that abstinence is "difficult."

To Today's Matt Lauer, who asked what message she was sending teens by talking about not having babies while she was holding her sleeping son, Tripp, in her arms, Palin said, "I'm just here trying to tell teens this is a really hard job."

The TV appearances were keyed to Palin's new role as the Candie's Foundation's teen ambassador for a national campaign to raise awareness about the consequences of teen pregnancy.

On Levi Johnston

Cuomo and Lauer both asked Palin about her former fiancé – and the father of her child – Levi Johnston, who appeared on Tyra Banks's syndicated talk show as well as CBS's The Early Show, on which he spoke about premarital sex and made claims that the Palin family has not allowed him be alone with his son.

"I'm not here to talk about my personal life," Palin told Lauer, though she did say, with no further explanation, even when asked for it, "I'd love Levi to be part of [Tripp's] life."

She had the nearly exact same words for Cuomo, too, saying, "I'd love Levi to be a part of [Tripp's] life, and I know he will be. Every child needs a father."

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