Our children are growing up fast and unfortunately, a lot are exposed to sex and pornography earlier than we think. What can we do as parents to help them with this? As we know things can't be unseen. Communicating about our bodies functions, and what our genitals are there for is a good start. Explain that our private parts are just that; private.
If someone is showing nude pictures, especially if it makes them uncomfortable; go and tell an adult. From the age of 7-8, use the word pornography and explain if they come across it to close their eyes! Explain why this is a good idea. Also, talk to your children's friends parents about your boundaries and what you think is suitable for your child. We might think most of us are on the same page but that is not always the case.
Talk about respect of each other and values like it's OK for girls to be valued as strong, clever and capable as well as boys to be gentle, caring and sensitive.
This is a great start. There is a lot of information out there how to talk about these things. Please do!
Here is a link to a good, informative article: https://www.todaysparent.com/family/parenting/age-by-age-guide-to-talking-to-kids-about-sex/