It's a me! Mario-o...oh...oh, mama-mia.
Super Mario World 2: Yoshi's Island
- In the midpoint of World 3, Yoshi and Baby Mario are shrunken by Kamek, allowing Prince Froggy to swallow them whole. The battle takes place within Prince Froggy's stomach. Once Yoshi has defeated him (by attacking his uvula), they exit the stomach... via the bottom. When they have exited Froggy's body and returned to regular size, Yoshi's wide-eyed stare directly at the camera leaves little doubt that they were just defecated out of Froggy's body. 
- Yaridovich claims, "I got to my lofty station in life by... ahem... 'pleasing' my superiors."
- Valentina's 'hit' animation seems to involve little but gainaxing.
- If you look around her bedroom, you can find Princess Toadstool's "???". We're not told what it is, but her grandmother will immediately run over and bribe you to leave it be. Go back and find it again when the princess is in your party, and she will yell at you for going through her things.
- One of King Calamari's (a gigantic Blooper, AKA squid, for the record) attacks is to use one of its tentacles to snatch away one of your party members. When they're returned to the battle a few turns later, they'll have gained the "Fear" status. Hmm...
- One level in Mario Zone is shown on the map to be right inside the giant wind-up Mario's crotch. Just a coincidence, you say? The level itself is filled with all sorts of balls, used as flooring, background decoration, spiked, floating obstacles, and enemy projectiles. There are hundreds upon hundreds of balls in the level!
- One quest involves returning a "special tape" from Goompa in Goomba Village to Koopa Koot in Koopa Village. The contents of the tape are never mentioned, save that Goompa keeps it... well hidden.
- During the scene where Peach can disguise herself as one of Bowser's troops, you can interact with a particularly flustered Hammer Bro in the library. He protests that he's not looking for "that book", and bribes you to leave.
- Similar to the tape from the first Paper Mario, this time with a mysterious 'package', from one Goomba to another. Add to this the fact that this delivery is made in the back streets of Rogueport, and the Goomba for whom you're delivering it tells you not to be seen, well, it just speaks for itself really. This happens in the third game as well.
- A very easily missed "crap past the radar moment" is when Mario is trapped in the cage by Crump in Chapter 2 with all the Punis. Use Goombella on Puniper [the big Puni] and she'll say, "That's Puniper of the Punies. He's a little bigger than the others, obviously. So maybe he can help us reach that special spot... Hee hee! Just kidding. His only special power is complaining, I think." 'Special spot' would not be that suspect if she hadn't immediately said, "Just kidding." This tattle, by the way, only occurs when you are in the cage — after you get out of the cage and free the Punis, you'll get a different tattle.
- Ms. Mowz is a mostly G-rated Femme Fatale, but that doesn't stop Goombella from repeatedly calling her a "floozy" — for those not in the know, an antiquated term equating roughly to the modern "slut." Clearly, Goombella is a bit jealous of how forward Mowz is with Mario!
Goombella: Ms. Mowz was here before, but I think she took the next train to Floozyville.
- Also radar-dodging is one of Kammy Koopa's lines after her visit to the Glitz Pit, regarding shaking what her momma gave her — in wavy text to emphasise it.
- The between-chapter Peach segments contain a few instances of Fanservice that managed to scoot by the radar. Some chapters allow you to have Peach take a shower before meeting with TEC and one chapter has Peach pull an Invisible Streaker to sneak around the enemy base. Nothing is shown on screen, mind you, but even the implication of nudity is surprising for a Mario game.
- Flurrie herself. She's a buxom woman with noticeably large breasts that move up and down with each step the player takes and they make their own sound. Her body slam also mentions that she uses her... "stage presence" to attack enemies.
- In one of the cutscenes where Mario must talk to Frankly about the current Crystal Star's location, Frankly says "Assuming will just make-, well, you know the saying".
Flurrie: Yes, how inappropriate.
- In Chapter 4, Mario finds the wife of the Twilight Town shopkeeper distraught that her husband has been turned into a pig. When he returns after lifting the spell, he finds that the pig in the shop wasn't her husband at all, but rather the Handsome Lech Frenchman of the game, Dupree - and the real husband was none too happy to find this strange man in his home! While nothing explicit is said, it's clear that the shopkeeper thought some sexual infidelity was going on behind his back. The two men have a verbal throwdown, and the wife even teasingly comments that Dupree is younger and cuter than her husband and it may be time to trade in.
- At the end of Chapter 1, against Hooktail, she'll make three different offers for you to stop attacking her. The first two are typical, being a bribe for 1,000 coins and a rare Badge respectively. The third bribe falls straight into this category, making an offer with Mario to... smell her feet, even mentioning that 'people pay for this'.
- When Bowser Jr. claims Peach to be his mother, Peach has to think about it first. And even as of the end of the game, she never denied it.
- In Hotel Delfino, Mario is freely able to enter the ladies bathroom...While it's occupied...Though he gets yelled at by the female Pianta if he talks to her. It's actually required for a few missions.
- Two Piantas are fighting over how tall the palm trees on their heads are. One could easily mistake it for comparing their… y'know. And since they are plant people, maybe that's not too far off.
- The Doot-Doot Sisters: "doot-doot" (rhymes with foot) is a slang term for nuzzling a woman's boob (or pressing against it).
- Using the Plunger Thing sticker as an attack results in a plunger slowly approaching the enemies, jumping on top of them, and then vigorously pumping up and down. This would all be fine and dandy... if saxophone music didn't play during the entire time.
- One of Waluigi's goal celebration animations is the crotch chop.
- Wario does this on one of the loading screens.
- After beating Wingo for the first time, Toadette gets stuck headfirst in the ground. Captain Toad has to pull her out in a way that seems very...suggestive, to say the least.
- In Mario & Luigi: Partners In Time, Toadsworth repeatedly, in every line of the tutorial, insists that the Bros. Ball move (in which both brothers interlock their bodies to form a ball) "requires a bit of an open mind", that it "is not a bit odd" and that the audience and brothers should "keep the jokes to themselves", amongst other things about how innocent it is.
- In the French version of Bowser's Inside Story, one area is called "Cul de Sac". Now, Cul de Sac is a perfectly acceptable term, but said area is inside Bowser's... rear area (And "Cul" is basically French for "ass"). That's right: the translators managed to say "Ass" in a Mario game.
- In Dream Team, one Pi'illo early in the game calls Starlow nude. Also, Starlow and Dreambert later distract some Shy Guys by gossiping about a birthmark on Bowser in "that place".
- In Bowser's Inside Story, right before you fight the Blooper boss, you get this:
Fawful: It is I who added the nuts to that statue. note
- In Partners in Time, the Bros., Toadbert, Baby Bowser, and several Yoshis leave Yoob by what is implied to be falling out of its buttocks. Might be lessened considering the egg-laying Yoshis do over the series and how it could be compared to that, but that's still pretty bold Toilet Humour by Mario standards.
- In Paper Jam:
- When Luigi gets stuck in the wall, Mario tries to pull him out of there. But the angle of Mario and Luigi look rather...should we say inappropiate?
- Again in a blink-and-you'll-miss moment, when the trio and princesses glide down from Bowser's Castle to Sunbleam Plains, it looks like Paper Peach is looking up her 3D counterpart's dress. You can say this is unintentional from the game's coding, but it's still rather suggestive once you look at it.
- During the toad rescue mission where you hammer stone blocks and try to get the toads to the ground, on the last puzzle... the shadow of the completed puzzle looks suggestive to say the least.
- Game reviewer Jimmy Whetzel sums it up the best.
- One mini-game called 'Grab Bag' appears several times throughout the series, and it's all about grabbing other people and shaking their bags to steal more coins. The animation for grabbing characters and shaking them up is quite... unsettling. This applies for every character, such as Peach, and DONKEY KONG. (The Runaway Guys hung a big lampshade on this one.)
- Toad in Mario Mario Party 2 will dress up in different costumes for each board and will do a different animation when revealing where the star is, which is sped up slightly upon the reveal for Baby Bowser. This particular bit becomes utterly hilarious for Pirate Land, where Toad (who has a little dinghy around his waist) essentially looks like he's humping the air.
- Mario Party 8 had a game that involved the characters on-screen shaking up a drink and then the winner had the highest geyser. The controls? Well, they're require to shake the Wiimote in a motion that's...interesting to say the least.
- One of the more suggestive exchanges:
Lena: I want you.Koopa: Now is hardly the time or place for that, Lena.
- Getting "Love Is the Drug" on the Boom Boom Bar's jukebox.
- Mario trying to get the meteorite shard from Big Bertha is rather suggestive in of itself...
- There exists a chess board with Mario characters, with Mario's Heroes facing off against Bowser's Troop. It features Luigi as Mario's Queen, and Bowser Jr. as Bowser's Queen. Why they didn't get, say, Peach to be Mario's Queen is anyone's guess, though it's likely that they wanted to use only Mario characters that would be as recognizable as possible and they only had so many recognizable ones to fit in all of the spaces.