It’s never too early to talk about sex with your child. Talking about sex, sexuality and bodies from when your child is young can help your child understand that sex and sexuality are normal, healthy parts of life. It can also make conversations easier later in future.
The main message to get across to your child is that he or she can come to you for open, honest and reliable information, and that he shouldn’t feel scared or embarrassed to ask you about sex and sexuality.
And the good news is that talking about sex and sexuality is not a one-off conversation that you have to get exactly right. It’s a conversation that continues and evolves as your child grows up. Sexuality is not just about sex. It is also the way your child feels about his or her developing body. And it is how your child understands and expresses feelings of intimacy, attraction and affection for others, and how she develops and maintains respectful relationships.
THREE STEPS FOR TALKING ABOUT SEX
Three basic steps can help you talk with your child about sex:
• Find out what your child already knows – for example, ‘Where do you think babies come from?’
• Correct any misinformation and give the facts – for example, ‘No, babies don’t grow in their mummy’s tummy. They grow in a special place inside their mummy called a uterus’.
• Use the conversation as an opportunity to convey your family values – for example, ‘It’s wonderful to be pregnant when you’re ready to take care of a baby’.
TIPS FOR TALKING ABOUT SEX
The following are tips that can make it easier to talk with your child about sex:
• The Language Must Be Simple And Honest:
Explain things at a level that your child can understand. A six-year old won’t want a long explanation of ovulation, although he might be fascinated to know that women have very small eggs (or ova) that can make a baby.

• It Is OK To Say ‘I Don’t Know’:
Your child doesn’t need you to be an expert – she just needs to know that she can ask you anything she needs to. If you don’t know what to say, tell your child you’re glad he asked, that you don’t know how to answer, and that you’ll look for some information and get back to him or her. And then make sure you do get back to him or her. Or you could suggest looking for information together.

• Get All Parents Involved:
In families with two or more parents, it’s good for all parents to get involved in discussions about sex. When all parents get involved in discussions about sex, they show children that it is OK to talk about sex and sexuality. This can help all children to feel more comfortable talking about their bodies, to take responsibility for sexual feelings, and to communicate in intimate relationships when they’re older.
• Start A Conversation:
Some children never ask questions. So you might need to start the conversation. It is a good idea to think about what to say beforehand, so it is necessary to pick a good time to bring the subject up. For example, if someone is talking about pregnancy on TV you could say, ‘They were talking about pregnancy on the TV earlier. It got me wondering if you know what that is. Do you?’.

• Prepare Yourself:
You might feel embarrassed talking about sexuality, or you might feel uncomfortable using words like ‘penis’ or ‘vagina’ to talk about bodies. That’s normal. It is a good idea to prepare yourself by thinking about a topic you are comfortable with and building on it. For example, if you are OK with talking about breasts and not Vagina, try using the word ‘boobs’ in conversation to start with.

here is the link of a video i saw on Facebook on parents educating their childeren about their sexuality.
https://m.facebook.com/story.php?story_fbid=831080907066991&id=78439279840246

Talking about sex, sexuality and bodies: tips for different ages
You will need to tailor what you say to your child to suit her age and level of understanding.
• 0-2 YEARS:
Using the correct words for body parts helps your child learn about his or her body, so use these words from the start – Vulva, Vagina, Breasts, Nipples, Penis, Scrotum, Testes. You can use everyday moments to do this – for example, bath time or while you are helping your child get dressed are good times to introduce the names of body parts.

• 2-3 YEARS:
Most children aged 2-3 years are very curious about their own and other children’s’ bodies. They’ll also notice that boys’ and girls’ bodies are different. Your child might ask you why or say, ‘What’s that?’ You can teach your child that every body part has a name and its own ‘job’ to do. For example, boys have a penis, and girls have a vulva. You might find that looking at a book with your child is helpful. You can use the pictures to help your child learn the names for body parts and understand the differences between boys and girls.

• 4-5 YEARS:
Children aged 4-5 years often ask where babies come from. They can understand that a baby grows in a mother’s uterus, and that to make a baby you need a sperm (like a tiny seed) from a man and an ovum (like a tiny egg) from a woman. If your child asks ‘Where do I come from?’ you could ask, ‘What do you think?’ This helps you work out what she’s really asking and how much she understands. You could give a simple explanation like ‘Babies grow in a place inside their mother called the Uterus’. If you are pregnant, your child might ask, ‘Where would the baby come out from?’ Give a simple but accurate answer like ‘Your little brother is growing in my uterus. When he’s finished growing, he’ll squeeze through the birth canal, which is called the vagina’.

• 6-8 YEARS:
By six years old, many children are interested in how babies are made and might ask questions. If your child asks, ‘How did the baby get into your uterus?’ ask him what he thinks. This will help you understand what your child already knows. You can explain simply, giving as much information as you’re comfortable with. For example you could say, ‘To make a baby, a sperm from a man and an egg from a woman join together.’ You could also explain that this happens when a man and a woman have sexual intercourse, which is when the man puts his penis inside the woman’s vagina. You don’t have to wait for your child to ask you a question. You could start a conversation by asking, ‘Have you ever wondered how you were born and where you came from?’ Or you might see a pregnant woman and say to your child, ‘That woman has a baby growing inside her. Do you know how the baby got there?’ You could also read a book together about where babies come from.