I don't think I would be having condoms in a common place because I wouldn't want my children feeling like I was checking up on how many they used or anything but will be happy to provide them with their own which they can store and use at their own discretion. I've had two wonderfully accidental pregnancies so I will definitely be reinforcing the importance of protection and wanting to foster an open relationship so I can support them in whatever way they deem appropriate.

My girls both usually end up in the bathroom with me so they know the basics of menstration, my DD1 loves helping with "stickers" lol lovely when she is yelling that out in public bathrooms! When we teach body parts, we use the correct names. We just discuss things are they come up, how babies are made hasn't yet but when it does I'll be happy to provide them with age appropriate information.