I had to give up at about 2.50 when the voiceover just became ludicrous, it was like watching something out of Pete & Pete but with a creepy stealth-sexualisation-of-minors edge. It was fine up until that point, but... ugh.
Misplaced creepiness in something that's intended to lovecraftian, how odd 9_9
Also their biology teacher sucks and hasn't bothered to read the textbook herself, or even acquaint herself with her own anatomy. The vagina is the central bit at the bottom, between the cervix and the outside world; it doesn't "contain" the uterus etc. The full diagram is, simply, "female reproductive system". Though, granted, that probably wouldn't work in the semi-poetic context of the monologue....
(I don't recall seeing membranes that link the ovaries to the vag before though... maybe that's a new addition? Nor any teacher who could seriously be so bothered to render such a high quality, hour-plus-in-the-making chalk diagram for something that'll probably be wiped away after the first fifteen minutes and she evidently doesn't know much about either (so ends up filling time by having the kids learn by rote rather than studying their set text and doing a Q&A). Seriously, that kind of thing ends up as being a rather sparsely coloured-in transparency on the OHP (or these days, a powerpoint slide on a data projector) which takes seconds (or a few unattended minutes) to make ready for showing the picture to the kids. And it can be mass-photocopied (/printed) for worksheet purposes.)
Dunno what repressed area he grew up in either but we got all of our giggling about this stuff out of our systems long before the actual sex ed lessons (both years before in some cases, and certainly that year once at least one of us had idly skipped ahead in the book and come across that chapter & shared it with us)... so said lessons ended up as pretty tame affairs, with only mild sniggering at the obligatory "condom on a banana" demonstration, and ultimately a rather interesting off-the-record discussion (well ok: bitching session by the teacher) of the effects of Section 28 on the effectiveness of her teaching this stuff to us. Particularly as we had at the time, and I still retain 10+ years later, a strong suspicion of her being lesbian (of the hot but smart and tomboyish kind).