No idea why your item would be removed while others remain.

But removal is at ebays discretion

Most adult items are subject to some form of restriction or prohibition. We'll review the content of the listing description, images, and categories, to determine if an item is allowed.

What is the policy?

Sexually-oriented adult material is not allowed. This includes the following:

• Films and video games classified as RC (refused classification), X or created for an adult audience
• Adult magazines, books, comics, nudist publications or adult anime/manga that include sexually-explicit content, nudity, or sexual stories
  • The following magazines and books can be listed as long as the listing and product don't contain nude images or explicit content: Playboy, Playgirl, Mayfair, and Penthouse
• Listings containing nudity (other than nude art)
  • eBay defines nudity as male/female genitalia, anus, or female breasts where the areola or nipple is visible