Ads totally inappropriate for children

My children like playing this app, but one of the ads was very disturbing and inappropriate. And there wasnt a way to take it off. Just a picture right in the middle of the screen of a woman taking a bath with her elbow showing to make it look like her breast. And it was very realistic looking! I dont want my children having these images thrown in their face when Im thinking theyre just practicing piano songs!

Barbalona about Grand Piano Keyboard&Metronome, v1.6