We've all seen it, from the endless attempts at sexualizing children to the walking degeneracy of 'pride parades'. This has long been going on for decades but I want to look at it from two angles, the biological side and the ideological reasons they are doing this and why this is both a weakness and extremely dangerous.
Biology first, since sex is required for the simple 'continuation of our species' nature gave us some incentives to first have sex and stay in a committed relationship since our children take longer to be self sufficient. There are several chemicals linked to sex (oxytocin, dopamine and phenylethylamine) that encourages you to not just have sex but stay together and even cuddle after (which is stronger in women). So what's the downsides if you just act promiscuously? Depression, anxiety, more prone to alcohol and drug addiction, inability to create long term relationships and the list goes on. I think a lot of us that have first or second hand experience with promiscuous women and guys too have seen these trends.
Now for the ideological side, the left knows that healthy relationships in a nuclear family setting are detrimental to their movement thanks to biology, so have been trying ever since the 'sexual revolution' and before that to subvert this. By switching the focus of sex from building a relationship and family to pure self gratification, we have seen the west deteriorate to more single families, rise in STDs and extreme levels of sexualization.
Now to why it's both a weakness and dangerous, the left's focus on this means that on ANY issue, so long as you can relate it to a fetish and therefore sexual gratification, they will endorse it. Try it as a thought experiment, with any position on the right that the left opposes, turn it into a fetish and once you fetishise it, you'll find a section of the far left that encourages it. Abortion, switch it to breeding fetishes especially if it's interracial. They already fetishise being conquered and controlled so that covers a lot of the 'oppressive hierarchy' they talk about. Even 'trad wives' as it's no coincidence they talk about beatings about it like they are trying to make it into a BDSM lifestyle.
This is extremely dangerous because it's now a drug to them and these addicts take this mind frame and project it onto others, that everyone would be happy if they where like them, constantly getting that next hit of sex to keep them going.
I'll start ending it here but one additional point, a question might come up of 'if they are this addicted to sex, why are they so opposed to it in fantasy?' Simple, because like a drug addict, they are living in a delusion, and if that delusion is ever broken, they will hit a low they can't recover from. So they'll lash out at ANYTHING that reminds them of a difference in reality and fiction and people able to draw sexual degeneracy but live normal fulfilling lives is the greatest example of that. It's why they have no problems with to even encouraging sexualization of children since this doesn't hurt their delusion that sexual gratification is the ONLY important issue but a drawing of it harms them because you can go 'this is fiction so doesn't matter, that child in the real world needs to be protected'.
TDLR: the left has become sexual addicts in their attempts to subvert western culture and are a danger to those around them.
It means you're a grown up.
You don't think with your dick anymore and realize all hot chicks will hit the wall and if sex is all she had to offer then she'll suffer the most from it.
As for the Bio-Leninism and communism part, That quote is disingenuous and omits a certain ugly truth. The truth that Bio-Leninism is employed by commies for few reasons.
You take a group of people who already have an axe to grind with the world and use them to overthrow the current order. Then you put few token uglies into position of power.
They are benefits to doing so:
First is their absolute unyielding loyalty, not because of virtuosity but for their desire to preserve themselves. Because of that they will support any outlandish initiative like Lysenkoism, not because they agree with it, but because if they don't then the commies will throw them out right where they got picked up. They'll be right where they started, except this time they will be surrounded by people with a grudge. It's ironic really, despite being in position of power, they are the ones who are now most insecure, even more so before they got picked up by commies.
Another good use of Bio-Leninism is scape goat. Since uglies are put up in front as a leading figure, all the ire and diss-satisfaction is aimed directly at them. If it reaches a critical mass then they are thrown to the wolves, so to speak, to satiate the oppressed masses even though they were loyal to the bitter end.
I think that is a great part of it as ruthless authoritarian rules often have the worst degenerates in charge because they know they will be in the sewer again or dead under a new leader (just look up Lavrentiy Beria as an example of this) so extending it to physical attractiveness seems the less extreme but still the same kind of policy.
I also see it easily with regards to trans as the ones that can 'pass' all seem to be absent from the trying to sexualize kids party..