My daughter has gotten to the age where she asks embarrassing questions about sex Just this morning she asked "is that the best you can do"
I don't think its appropriate to make such jokes about children.
Yes, I mean if your kid asks about sex, you can't go into detail with it.
Many children are victims of incest and molestation. To make light of such things trivalizes their struggles and trauma they've experienced. Try educating yourself about how these people struggled into adult hood before making such jokes.