There were also two sibling incest jokes on American Dad where Steve a) passionately kissed his sister after being tricked into believing he was adopted, and b) unknowingly masturbated repeatedly to his sister's nude portrait. Then in Joe Dirt, the main character joked that he pretended the girl he was sleeping with was his sister, but it was less of a "haha" joke and more of a "haha, I'm laughing which totally means I didn't really do it haha please believe me" joke.

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It's Always Sunny in Philadelphia also had an incest joke about one of the characters thinking he accidentally made a nephson with his sister, which is fitting considering that the show takes place in the city of brotherly love. Likewise, Married... with Children, Buffy the Vampire Slayer, and Firefly have dealt with heavier subject matters before so it wasn't that big of a shock when they had a laugh about siblings possibly being in Lannister with each other.

However, the incest jokes almost always boiled down to "Isn't it hilarious to imagine these people actually being into/IN their family members ... you know, because they're really not. We're normal! Of course WE don't fantasize about this stuff! There's no need to check our browsing histories. Haha!" Even when siblings engage in a passionate tongue battle like in EuroTrip, it's still played for laughs because no actual sex is involved, as if Frenching your sister instead of straight-up boning her made baby Jesus weep less. This holds true even with notoriously unfunny shows like Game of Thrones where purposeful, full-penetration incest is the source of drama, but ACCIDENTAL, second base incest is just a wacky, comedic mishap, no different than slipping on a banana peel and landing hand-first on your sister's boob.

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In Hollywood, any joke about two consenting adults is fair game, even if those adults are siblings and the joke is that they almost got some non-strange strange. That's why parental incest is almost never joked about because there can never be true "consent" between a parent and child. A parent and child share an unfair dynamic where one exerts immense influence over the other, so even an adult child could never really "agree" to having sex with their parent. And now having written that, I'm going to take a shower to wash the shame away. Be right back.