While there is nothing wrong with talking about this stuff with kids, other than making a funny video, it's not really neccesary to talk about sex with kids this age.
Absolutely, answer any questions they may have, but you can wait until they are 8-9-10 to talk about this stuff... just before puberty.

I'm not saying to hide it from them, but to sit them down for "The Talk" at this age is a little silly. If they are showing signs of knowing stuff, and you want them to have the right information, you can ask small questions that will give away how much they know and you can steer them in the right direction.

In the end, it IS the parent's prerogative though.
Don't scare your kids though

But, I did love the parent's discomfort in the video. (the real humor here)
it's often the parents that feel more uncomfortable talking about this stuff, than the kids. Unless you wait too long and the kids are just rolling their eyes at you, because they pretty much know what your saying before you get it all out.....

Bingo. It's not uncomfortable or strange AT ALL for the children. They have no context whatsoever. They pick up the sentiments from the parents.

Speaking to kids as though they are idiots is a terrible approach, and people really shouldn't do that. Even as young as six or so, most of them are much more intelligent and thoughtful than they're usually given credit for.

Granted, I wouldn't want to dictate the way other people raise their kids, but the years I spent volunteering with children taught me that they will be a lot more open, honest and comfortable with you if you converse with them with all the seriousness and respect that you would an important adult, but of course all the while understanding and having empathy for their necessarily limited set of experiences, egocentricity and smaller view of the world. For example, "my best friend hates me" seems trivial to an adult ("make new friends"), but could be a kid's whole world crashing down.

Even though the people in this video are doing an admirable job (even those who screwed up earlier by inventing a fairy tales to avoid a brief moment of embarrassment), the underlying subtext that the kids are likely picking up from their parents obvious uncomfortableness is that sex is a shameful thing and that discussing it (such as if they have questions in the future) will be painful and is best avoided.

True story.

Went to the presentation at school, at night. All the boys went one night, the girls on another. Fifth and sixth graders, but my mom took me as a fourth grader, my brother went as a fifth grader.

After both of us had seen the presentation, my parents sat with us in the backyard. Asked if we had any questions.

I had one. "How does the sperm get across the bed? Does it crawl?"

They showed all the apparatus, but they never told us the delivery method!

My parents didn't answer then. My dad tried to tell me later. Always at dinner time, which was weird.

I learned by then that this was something not to be discussed (picked that up from my parents, clearly!) Dad would try to tell me, I would squeal and run upstairs.

My father is not a patient man.

One night, he leaned over and unplugged the toaster. "Gale, in electrical terms, this is the male and this is the female." And he plugged in the toaster.

I squealed and ran, but the info was transmitted.

Stupid Disney movie didn't tell us.

This was in 1963.

odd, but humorous.

tmi

Love how the asian kid already has all the facts.