A little background from Comicsalliance:
"As the art in this gallery shows, it's not just about getting tied up. There's a woman who keeps another woman as her dog (complete with skintight puppy suit), and there are women spanking each other with various tools, riding each other like horses, and forcing each other to dress up like babies.
There are three narrative sources for kink in Wonder Woman. First, there are the Amazons, who have weird BDSM rituals and bondage filled-games. Second, there's the Beeta Lambda sorority at Holiday College, where Wonder Woman's sidekick Etta Candy always seems to be initiating somebody. And finally, there are the villains, who don't just tie people up; they keep slaves as a matter of course."
From a Smithsonian Magazine article on Wonder Woman: In his original scripts, Marston described scenes of bondage in careful, intimate detail with utmost precision. For a story about Mars, the God of War, Marston gave Peter elaborate instructions for the panel in which Wonder Woman is taken prisoner:
“Closeup, full length figure of WW. Do some careful chaining here—Mars’s men are experts! Put a metal collar on WW with a chain running off from the panel, as though she were chained in the line of prisoners. Have her hands clasped together at her breast with double bands on her wrists, her Amazon bracelets and another set. Between these runs a short chain, about the length of a handcuff chain—this is what compels her to clasp her hands together. Then put another, heavier, larger chain between her wrist bands which hangs in a long loop to just above her knees. At her ankles show a pair of arms and hands, coming from out of the panel, clasping about her ankles. This whole panel will lose its point and spoil the story unless these chains are drawn exactly as described here.”
Later in the story, Wonder Woman is locked in a cell. Straining to overhear a conversation in the next room, through the amplification of “bone conduction,” she takes her chain in her teeth: “Closeup of WW’s head shoulders. She holds her neck chain between her teeth. The chain runs taut between her teeth and the wall, where it is locked to a steel ring bolt."
Apparently Wonder Woman editor Max Gaines started to figure out that something was going on. In February 1943, Josette Frank, an expert on children’s literature, a leader of the Child Study Association and a member of Gaines’ advisory board, sent Gaines a letter, telling him that while she’d never been a fan of Wonder Woman, she felt she now had to speak out about its “sadistic bits showing women chained, tortured, etc.” She had a point. In episode after episode, Wonder Woman is chained, bound, gagged, lassoed, tied, fettered and manacled. “Great girdle of Aphrodite!” she cries at one point. “Am I tired of being tied up!"
Gaines later received a letter from John D. Jacobs, a U.S. Army staff sergeant in the 291st Infantry, stationed at Fort Leonard Wood, Missouri. “I am one of those odd, perhaps unfortunate men who derive an extreme erotic pleasure from the mere thought of a beautiful girl, chained or bound, or masked, or wearing extreme high-heels or high-laced boots,—in fact, any sort of constriction or strain whatsoever,” Jacobs wrote. He wanted to know whether the author of Wonder Woman himself had in his possession any of the items depicted in the stories, “the leather mask, or the wide iron collar from Tibet, or the Greek ankle manacle? Or do you just ‘dream up’ these things?”
Gaines forwarded Jacobs’ letter to Marston, with a note: “This is one of the things I’ve been afraid of.” Something had to be done. He therefore enclosed, for Marston’s use, a memo containing a “list of methods which can be used to keep women confined or enclosed without the use of chains. Each one of these can be varied in many ways—enabling us, as I told you in our conference last week, to cut down the use of chains by at least 50 to 75% without at all interfering with the excitement of the story or the sales of the books.”
Marston wrote Gaines right back.
“I have the good Sergeant’s letter in which he expresses his enthusiasm over chains for women—so what?” As a practicing clinical psychologist, he said, he was unimpressed. “Some day I’ll make you a list of all the items about women that different people have been known to get passionate over—women’s hair, boots, belts, silk worn by women, gloves, stockings, garters, panties, bare backs,” he promised. “You can’t have a real woman character in any form of fiction without touching off a great many readers’ erotic fancies. Which is swell, I say.”
Marston was sure he knew what line not to cross. Harmless erotic fantasies are terrific, he said. “It’s the lousy ones you have to look out for—the harmful, destructive, morbid erotic fixations—real sadism, killing, blood-letting, torturing where the pleasure is in the victim’s actual pain, etc. Those are 100 per cent bad and I won’t have any part of them.”