Children and sexuality
There comes a time that parents will have to talk to their children about sex. This is a normal and natural event in every parent's life. Now a days the generational change and the many things that have happened in our society. It is possible that your parents might have not discussed sex with you in an open way because back then things were different. It's ok to feel uneasy, tense or uncomfortable when talking about sex with your child. Don't hide it, be open about it, tell them: "You know, I'm uncomfortable talking about sex because my parents never talked with me about it. But I want us to be able to talk about anything, including sex, so please come to me if you have any questions. And if I don't know the answer, we'll find out together".
There are many books written for both parents and children on the matter. Detailing all you need to know, how to answer your child's questions and how to engage the conversation with your children. The main importance is that your children feel safe talking to you. You don't need to know all the answers, what's important is that you are open to talk to them about any subject at any time they need. Engage your children and discuss the subject openly.
Your children might find on your computer a website that perhaps you didn't intend for them to see, from an adult website to an online pharmacy where you buy Viagra. Embarrassing situations like that are best handled in a straight forward manner. Tell your children what you were doing and why. For example, explain why you were browsing Viagra online, what is it for and such. Take advantage of the opportunity and avoid any generic Viagra conversation that might create confusion about sex and the many layers of depth the subject has.
Your children trust you and will turn to you in case that any question might appear.