I would expect it to reduce fertility because we know when you explain to girls how human reproduction actually works fewer of them are onboard because that sure looks like a traumatic experience. Oh so eventually after the other horrible side effects the parasite gets so large I have to push it out of my body through an orifice which is clearly not adequately sized for this purpose? Strong no.
But the other part sounds fun, so, why wouldn't learning about that encourage you? If you've done a decent sex ed course then a whole lot of fun possibilities are showcased, even if you think some of them are gross the others seem intriguing enough that I'd expect more rather than less will be interested in trying.
I think you are trying to come up with an individualistic argument for why sex ed should exist.
I'm just saying that observationally, traditional societies and sub-societies with worse sex ed that are less "sexually enlightened" tend to have more sex and fertility. Maybe it has something to do with breaking taboo?
Viewed through a certain lense, you could view abstinence-only sex education and denial of access to abortions is a psyop to get (young) women to become pregnant and attached and dependant on a man.
In a place where abortion was legal, I expect having sex ed would not significantly affect fertility rate but would decrease abortion rate.