Beavis and Butt-Head/Radar

Beavis and Butthead have moments that get by, even by MTV standards due to the target teenage audience.

In the episode "Dream On", you can hear Beavis mumbling "Fire, Fire"
To elaborate, this was after Beavis' catchphrase was Bowdlerised (to "fryer, fryer") because of the episode of actual pyromania it was falsely accused of in Real Life.
Not only that, in "Wet Behind the Rears" and "Buff N' Stuff", the boys are in the nude near the end. In the former, it was a trap set up by McVicker and Buzzcut to embarrass the boys for all the trouble they cause them, while the latter has Beavis sent to the showers with Butt-head whipping Beavis with a towel. The main characters are teenagers and they're in high school.
In some episodes, Beavis is seen trying to light a cigarette, like he did at the end in “Murder Site” despite being a teenager.
In “Buy Beer”, the boys actually buys what they thought was beer, but it wasn’t non-alcoholic.
“Bus Trip”, the boys are caught mooning other drivers and walked up to the front of the bus, even their pants still down.
“Breakdown”

Butthead: McVicker’s nuts
Beavis: What about his nuts

“Water Safety” – Beavis and Butthead are looking at the back of the female classmates in the beginning of swimming class.

Buzzcut: Lesson One - The doggie paddle
Butthead: Doggie style
Beavis: Yea, doggie style

The entire of “The Mystery of Morning Wood”… how did the concept get by censors, even if it aired after hours when most people are asleep?.
The beginning of “For Better or Verse”, a topless woman is seen with her back turn to the boys. Later in the same episode, Beavis is showing Butthead how to turn an aerosol spray can into a flamethrower while lighting his lighter… okay that did get pick up by censors, you can guess how.
“Trouble Urinating”… what do one think the title is about?
“Coach Fishing” – The biologist in the beginning gets his behind bitten by a fish known as a piranha. That’s not all though; check out this meeting with the elderly woman Butthead bring over.

Elderly woman: What happened to my spectacles?
Butthead: Your testicles

“Sporting Goods” – The guys had to get protective cup and… well, remind you they’re teenagers.
Let’s not forget about “Cyber-Butt”.
In “Canoe” – The boys got into a fight and landed in the water, they had to spend the rest of the episode in their underwear so their clothes can dry. While the guys had to go to the restroom, they overhear Driessen talking to Stewart in innuendo while fixing the tent. You can tell on the expression of the guys what they heard.
In “Ball Breaker” – Beavis gets hit in his privates three times with a bowling ball, the last one with a piece of it lands in the spot after being blown up.
The “Crisis Line” episode, the boys are chosen to handle the phone lines, it ends with the boys calling a sex-line.
“Walking Erect”, the boys goes and causes panic at a zoo by saying the snakes are loose. One of the visitors during the ‘snake escape’ is actually tuned on. The boys so panic themselves before going forward to capture the ‘snakes’ and when they did… they caught something all right when the lights were on. Beavis also qupis

He's not that big.

- During the episode, the boys went to the zoo to see animals with "morning wood".
“Tainted Meat”, about Beavis having a “problem”, Butthead tells him up front and says…

Butthead: Damn it Beavis, that away. You’re not supposed to have your penis out when you’re cooking.

“Scared Straight”, Butthead is seen using the toilet in front of Beavis and two prisoners. The two inmates were found to be fans of Iron Maiden, like them. The guard checks to see the boys having a great time with the inmates. How the censors did missed that when cases of sexual intention in prisons have been on the rise.
In “Closing Time”, while watching Human Behavior by Bjork, Butthead points out a giant teddy bear, which gets Beavis to ask:

Beavis: A giant titty bar, where, where, where

In “Beware of the Butt”, the boys finds a van where a couple is having sex and take pictures of the woman’s butt. the unnamed woman later gets even by having the boys hang upside down on a billboard, with their pants gone.
In “Butt Flambé”, Beavis is taken to the hospital after somehow his butt is burned.
In “Steward is Missing” Beavis asks Mrs. Stevenson this question. Granted, it has nothing to do with any sexual, but the duo did get in trouble for the subject matter.

Beavis: Is your house on fire?

How about the times Beavis says peek-a-boo when he has his hands on his pants, ready to moon someone? Keep in mind, Beavis is a teenager and had he done that in a school setting theses days...
While watching “Shine” by Meat Puppets, Beavis shows Butthead ‘his’, though censored by the music video. It’s implied that Beavis was exposing himself to Butthead, much to Butthead’s dismay.

Beavis: Hey Butthead; Look at my meat puppet.
Butthead: Damn it Beavis, pull up you pants...fart knocker!

In fact, while Butthead is a womanizer with the hopes of seeing a woman naked, he hates male nudity, especially from Beavis.