Interesting. I guess if you feel guilty about it, but not enough to change your behaviors, seeking absolution from someone who's more ethically pure would be a natural reaction. It's the basis for absolution in the Catholic church, and in begging forgiveness in prayer even in branches of Christianity that don't have human confessors. I think it's very human.

In your friend's case, it doesn't sound like she was a willing participant, and that sucks.