Jabba's affection for "dancing girls" is not common to all Hutts. Jabba is a specific Hutt who took pleasure in surrounding himself with bikini-clad dancing girls, but not necessarily the only one.
From The Hutt Gambit:
But Aruk was not one of those sybaritic Hutts who relished the pleasures of the flesh. True, he was a gourmet, and often a gourmand, but he didn't maintain entire palaces filled with slaves to cater to his slightest--or most perverse--whim, the way some Hutts did.
Aruk had heard that Jiliac's nephew, Jabba, kept several female dancing humanoids--humanoids, of all things!--on leashes near him at all times.
Aruk considered such indulgences distasteful and extravagant. The Desilijic clan had always had a weakness for fleshly pleasures.
Jiliac's taste was better than Jabba's, but he enjoyed hedonistic excess just as much as his nephew.
Since Star Wars in general is PG to PG-13, I doubt you will find out any information about any explicit sexual behavior the dancing girls are subjected to. Jabba's bikini-clad harem are almost always referred to as "dancing girls".
In Rebel Dawn, Jabba admires a woman's figure, but there is not anything explicitly sexual in the admiration. His feelings could be closer to how someone might want to dress up a cat or dog:
Jabba watched [Bria Tharen] as she walked away, and found himself thinking that's she'd look magnificent in a dancing girl's costume. All that reddish hair spilling down her bare shoulders. Nicely muscled shoulders. This human was fit, exquisitely so, and her height was impressive. What a dancing girl she'd make!
Other characters in the EU have impressions of what the dancing girls mean to Jabba.
For example, Dengar in The Mandalorian Armor:
Dengar could barely recognize her. He remembered her from Jabba's palace; she had been one of the obese Hutt's troupe of dancing girls. Jabba had liked pretty things, regarding them as exquisite delicacies for his senses, like the wriggling food he'd stuffed down his capacious gullet. And just as with those squirming tidbits, Jabba had savored the death of the young and beautiful.
And Porcellus in Tales from Jabba's Palace:
Porcellus had never learned exactly what Jabba did with his "pets," usually female but always young, lithe, and beautiful but he knew they seldom lasted long and he'd heard some truly horrible tales from his friend and fellow slave Yarna the Askajian.
At the moment, however, all the Hutt did was scoop up a fingerful of the vegetable-crepe stuffing and hold it out to her, and after a moment, with visible distaste, Oola licked the subtly flavored concoction from his slimy hand.