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The JTA thinks the RCC pulled it hechsher (supervision) when it found out the lubes are popular in the gay community and that some of them are made specifically for use in anal sex. I would add that even heterosexuals commonly do things with their mouths that rabbis don't like, even though the actual halakha – as opposed to Kabbalah and hasidut – permits them to be done.
Related Post: Personal Sex Lubes Get Kosher Supervision.