Frequent strong language and racial epithets, but nothing a public school middle schooler wouldn't be familiar with. The only explicit nudity is footage of two girls (from Woodstock '99) in 'Last Son of the West'. 'Meme' sex, below, means non-explicit pictures bumping into each other (which can still shock). Probably post-sex ed is a good idea.
Note that the 'narrated' episodes are clean (with the exception of brief female nudity in Last Son mentioned above), with the 'Meme War' and 'sitcom' episodes next cleanest.
Sex (worst first)
Trudeau's Diversity-a-thon - the worst of them all. Realistic 'cartoon' ejaculation, 'meme' homosexual sex and bestiality. But it's ok, it all happens to Justin Trudeau.
Against Time - 'meme' homosexual sex and drug use.
My Name is Aids Skrillex - 'cartoon' ejaculation with dildos.
Mandell's Milk - 'meme' ejaculation and homosexual sex.
Face the Strange - implied homosexual sex.
Last Son of the West - two topless women's breasts are grabbed (footage from Woodstock '99), some performer sits astride a giant stage penis.
Return of the Swede - 'meme' bestiality.
#brave - Bestiality is discussed, and Caitlyn Jenner and Putin briefly have meme hetero sex.
Gore (worst first)
This is all very cartoony and meme-y, it feels silly to detail it, but:
Border Runners 3 - a guy's head gets blasted into chunks, and a kid torn in half (all cartoon).
Guardian of the Rune - Guy gets ripped in half, there are somewhat gorey corpses (cartoon, I believe).
Dr Murdoch's No Good Very Bad Week - a guy gets run over (the gore looks real).
Burqas in Bongland - half of a corpse that looks like it's mostly returned to the Earth.
Skydaddies, Being and Time; The Ghost of Stonewall Jackson - heads shown with dangling backbones. Wizards and Bros, similar, but further away.
Ghosts of America - 'meme' - a black man's face slides down Murdoch's body.