Many words are used to describe intimate parts of body and different sexual behaviours – both medical and other words that are heard at home, school, at friends or elsewhere. A child can easily get confused about the meaning of different words, it’s possible that he doesn’t realise that some of them are offensive – though young children do learn it quickly by seeing the reaction of others.
It’s possible that you as a parent have words you don’t feel comfortable about. Make a list with words that you think are connected with intimate parts of body and sexual health. Mark the words that you have difficulties with when talking to your child. Can you replace it with another word? Maybe you know a slang term for this word?
You don’t have to toss away your standards and values but you as a parent are responsible for your child. He will get to know the slang words anyway, at a playground, for example. So it is better to talk about it and to prevent a use of these words in places where you shouldn’t use them by explaining the meaning.