I wouldn't have minded seeing that in Biology, just so long as presented in a moral pronatalist setting.
Is this really so new?
I remember being shown something like this in high school biology. The view was from inside the vagina showing the head of the penis as it intruded and subsequently spit up. I distinctly remember a classmate crying out, "Is nothing sacred?!!".
Of course it's "new" because it's curiously interesting, "scientific," and of course, an interest aspect of "animal biology" to see the act of the already "huge" human population growing further.
Should it be a "private" matter not to be shown in school? Maybe, but then, what people do in the privacy of their bedrooms swells human populations and makes us to populate the planet more densely. So it's also a very public matter, as the billions of penises in the world continues to grow. It has profound effects upon the world, most of which are actually positive, not negative. Not that "education" must always take some controversal position, and if it does of course any Sex Ed should favor the human race to go on growing naturally, merely to understand better the truth about why it should, and how to better ACCOMODATE our growth, if they can even get into all that. Anyway, I suggest the very public matter as a partial rationale as to why the public may enjoy watching humans reproduce, in a moral "educational" fashion, but of course. Just because human population may practically be nearly impossible to "control," doesn't at all imply that we should make any effort to. Until very recently, human population was accepted as just a "given," something to welcome and design around. Population is what it is.
Is nothing sacred? Yeah, humans like their privacy for sex. And yet, with so many people all around the planet so frequently "doing it," people may see other people copulating in some settings, walking in on their parents, or small cramped housing in developing countries, or during a family camping trip, or on that too small RVmany still don't have a separate "bedroom." So if people are probably seeing other people have sex in some setting, they might as well see the curious sight of the semen flowing from the penis into the vagina from within. To see the actual flow of human life and population growth, is quite a beautiful curious wonder. Yeah, it may help awaken or stir powerful reproductive urges for more people to have more babies, but that's generally a "good" thing to encourage anyway.
And it hardly seems out of context for a "biology" class. It is natural biology after all. I recall my biology class, all we had is those reproductive system drawings in our textbook, and a teacher who talked about sex somewhat, as if it was just a natural part of biology. No immoral explicit Sex Ed beyond what would reasonably be said in a Biology class.
I should add the observation that we had in some discussion as to the immoral trends in pushing Sex Ed, that co-ed classes may serve to break down healthy modesty between the sexes, a bad trend to promote that could lead to premarital sex. So part of the remedy there is to consider whether males and females should be separated for any "Sex Ed" class, or whether Sex Ed or a certain fashion should even be allowed. But then, separating the sexes may be a bit excessive, if it is after all, only a Biology class, and even more so, if at the college level? No doubt many young women also wouldn't mind seeing a penis "spit up" into a vagina. Would they think twice before engaging in sex and the baby fluid going into their bodies, or would that just make them want to do sex more?
Because it is sacred, is why any means of "birth control" should be discouraged, so as to not interfere with the natural flow of human life. I hardly think that "studying" the flow is near so bad, as hindering it.
Anyway, I'm not so sure that merely showing the "educational" aspect of how humans reproduce, violates the sacred, so long as the flow of human life is respected and natural and not interfered with, unless of course necessary to help it along with various infertility issues. In other words, I would vehemently object to the "advertising" of shoddy contraceptive use, not so much the "intimate" encounter, if male and female are husband and wife, and reproducing naturally and traditionally. No "kinky" porno garbage.
And parents should have their appropriate option to voice input or opt their children out of such things.