It is pretty well written and most of the people are not really educated about those questions of sexuality that can lead to misinformation or irresponsability (in terms of protection against infection for exemple)
Some ways that can improve your post in my opinion :
- Use more figures, the explanation of the mendtrual cycle can be better understood with simple diagram and I think that there are a lot of free to use resources about that on the web
- Maybe talk about ovulation with more details or fertilization, at least if you don't talk about it share link with us where we can get the right informations about it
But in any case it was a good and informative post.