SeaSaltyhair. Yes mine probably would have giggled at a truck swallowing vagina too. It’s childish silly humour, like giggling at words like bottom and fart.
Being safe comes from children understanding social norms, from knowing what is and isn’t acceptable, what is real. Parenting is about helping children navigate that and, actually, having something to show how silly/unreal/unacceptable waving a giant penis around is will probably help rather than hinder those discussions.
Little children aren’t ready for tales of Sarah Payne or Madeleine. It’s positively harmful to sit them down and explain violent rape as a real and significant risk. They need fantasy and safe ways to explore the unacceptable.
As I said, read Bettelheim. He’s better informed than the Daily Mail. Your thinly veiled insults are unnecessary. My safeguarding knowledge is good, thanks.