In "Dooku Captured" and "The Gungan General", Hondo and his gang demand "spice" as a ransom from the Republic in exchange for handing over Dooku. Anyone familiar with the Expanded Universe (or with Real Life slang) will immediately recognize that Hondo is asking for drugs. Worse still, the Republic (the supposed good guys) is willing to barter said drugs for Dooku. Let that sink in: Padmé, Obi-Wan and the other Jedi were ready to hand over a large amount of illegal drugs to a gang of criminals.
In case any of the viewers missed the real meaning of the term "spice", it was even lampshaded when Hondo had the drinks he offered to Anakin and Obi-Wan spiced.
Much later in the Season 5 premiere, spice made its on-screen debut. That's right they showed drugs in a cartoon!
"Dooku Captured" also had a scene when one of the pirates molested a "waitress" of their bar.
Similarly to the "Hidden Enemy" example above, "Gungan General" had a poster of a scantily-dressed Twi'lek girl posing suggestively, on the wall of the pirate base's speeder "garage".
When Cad Bane first met Ahsoka, he electrocuted her to knock her out, then handcuffed her. Afterwards he caressed her head in a creepy manner, before taking her Padawan braid as a trophy. He even asked her if she was "impressed" (which she said she wasn't before she was knocked out earlier).
In "Senate Spy," Padme and the Jedi Council refer to the fact that she used to have a romantic relationship with a senator currently suspected of treason. Throughout the entire episode no characters even once use the term date, dating, romance, girlfriend/boyfriend or any other explicit relationship term. Instead they use the terms "friendship" and "close friendship", with extreme emphasis on the "close", and occasionally with a significant pause before and after.
In "Lightsaber Lost", Anakin and Ahsoka were sent to arrest an arms dealer Anakin ordered Ahsoka to guard the entrance of the Bad Guy Bar, to stop their quarry in case he tried to escape. While waiting outside, Ahsoka noticed two pirates gazing her in a rather creepy manner.
In "Lethal Trackdown", Aurra Sing arrives at Ohnaka's hideout and kisses him. He then looks at young Boba next to her and goes "Not mine, I take it."
In a scene that did not get past the radar, because it was cut from syndication, Asajj kisses a dying clone on the cheek, then informs the cyborg General Grievous in a seductive tone that...
Asajj Ventress: My dear General... there is nothing you have that I could want.
Earlier in the same episode, following the start of the attack on Tipoca City, we see towers of cloning tanks being destroyed. That is hundreds of babies dying on-screen.
In "Assasin", there was a couple of shots on Aurra Sing's butt and cleavage, and Ahsoka bending over the balcony. Oh and by the way, the plot of the episode was about an assassination attempt against a politician.
In "Hunt for Ziro", there's a dance scene in the Hutt bar, with three barely dressed Twi'lek girls performing.
In "Monster", Ventress had a couple of blink-and-miss it Panty Shots while fighting the Nightbrothers.
"Prisoners" has Riff Tamson's death - he's destroyed by his own knife bomb, but what's really peculiar is that you can see the blood and bits of flesh from the body, as well as his head floating through the water.
The Season 4 Slaves of the Republic arc was full of this:
In the same episode, after the Zygerians thwarted the Jedi's attempt at escaping, Ahsoka was locked in a cage suspended at the top of the royal castle, with a shock collar on her. Atai went to her and told her, with a suggestive tone, that once Anakin bowed to the queen, Atai will own Ahsoka. Her response makes it very clear that, yes, he meant it like that, and she's fully aware of it. His expression while electrocuting her for the response also strongly implies this.
Also in the scene when our heroes arrive on Zygerria, Ahsoka asked why she was playing the part of the slave. Anakin responded with "the role of Master comes easily to me".
Two Twi'lek children were shown among the slaves a few minutes later.
A Twi'lek slave girl committing suicide after she failed to assassinate the queen.
In "Friend in Need", Bo-Katan, a female officer of Death Watch, slapped Ahsoka on the butt after examining her, remarking that she's a bit skinny. Immediately thereafter, Lux says "She serves her purpose.".
While drinking alcohol had been shown previously, in "Deception" Obi-Wan disguised as Rako Hardeen seemed to have been very off, and Anakin explicitly said "He's drunk."
Earlier when Hardeen entered the bar, a female guest mentioned on a very suggestive tone, that she "Wouldn't mind checking out his midichlorian count".
Also from the same saga, in the episode, "Friends and Enemies" as Anakin and Ahsoka are entering a bar, a very wasted Sy Snootles is shown leaving, escorted by two barely dressed Twi'lek girls.
In the same while Anakin is fighting Obi-Wan disguised as Rako, Anakin knees him in the groin at some point in the fight.
There was also Cad Bane's remark to Ahsoka about "they'll have to dance another time". Of course he meant fight, but putting it that way, had a quite creepy No Yay subtext.
In "Massacre", Ventress had to take a bath in what Mother Talzin previously called the "Water of Life" as part of ritual that established her as a fully recognized member of the Nightsisters clan. The goo stuck on her clothes really looked like something else.
In "Revenge", it's strongly implied that Maul slaughtered the children who went to his ship, expecting the supplies to have arrived.
In "A Test of Strength", Ahsoka foiled Hondo's attempt to lay hands on the lightsaber crystals the Jedi younglings just harvested on Illum, but is captured by the pirates in the process. Hondo, angry that he lost his profit, has Ahsoka knocked out by one of his men, then tells the unconscious girl that he'll turn her into profit, while holding her chin and caressing her lips. It's even more blatant in the following episode, where he notes that some criminals will pay handsomely for "a female Jedi" (emphasis his). The fact that Ahsoka's a minor makes this worse.
Hondo spends the last third or so of "Bound for Rescue" extremely drunk. A highlight is when he says "I may not be as young as I once was, but I'm older!" while being escorted by two scantily-clad female Twi'lek.
In "Mystery of A Thousand Moons" we get this little gem:
Anakin: If you ask me, it sounds like a load of s-