All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
First of all, we would like to clarify that such embarrassing questions which the children might ask should not be encountered by narrow mindedness and embarrassment or by repelling the children from asking such questions. There is no doubt that such questions should be encountered by saying the truth, but being truthful does not necessitate to be completely open and unreserved when answering them, and it does not necessarily mean that you are lying when giving a hint and using metaphors [or speaking about something indirectly]. Being open and unreserved may be contrary to being bashful and it may lead the child to be obscene and this is very serious.
Indeed, the Sharee’ah uses metaphors for matters that people are ashamed of. Ibn ‘Abbaas said: “The words Lams, Mass and Mubaasharah (which in Arabic literally mean touching): mean sexual intercourse, but Allaah uses a metaphor for whatever He wishes with whatever He wishes.” Indeed, these words are mentioned in the Quran.
Moreover, ‘Aa’ishah narrated that a woman asked the Prophet about performing Ghusl after menses. So, he ordered her how to perform Ghusl saying: “Take piece of cloth scented with musk and purify yourself with it. She asked: “How would I purify myself with it? The Prophet said: “Purify yourself with it.” She said: “How?” The Prophet said: “Subhaanah Allaah, purify yourself with it.” So, I [‘Aa’ishah] dragged her to my side and said (to her): “Follow the traces of blood with it.” [Al-Bukhari and Muslim]
An-Nawawi said: “The Hadeeth is evidence that it is desirable to use metaphors when talking about the ‘Awrah [private parts].”