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Apple is demanding that stores remove all posters for the gadget, called an iGasm.
"We hope this request to remove it immediately will prevent us having to consider further action," said Apple lawyers.
The Ann Summers neon-pink ads feature a sexy woman with wires coming out of her iPod and into her knickers, teasing "Go at it hard and fast with a pounding drum 'n' bass track or chill with ambient classic."
The iGasm advert
Apple lawyers claim the poster is a blatant rip-off of its famous iPod silhouette images.
The News of the World newspaper reports Ann Summers boss Jacqueline Gold saying: "Perhaps I can send them an iGasm to put a smile back on their faces!"