I also know whereof I speak. When they were first introduced here, they ran an ad campaign stating that they were designed by a woman gynocologist and consequently the "OB" stood for confidence.

I wrote a letter to the manufacturer questioning their reasoning and also requesting that they tell me the true meaning "OB", because my mind still kept tuning over stuff like "orfice bung", among other things. They never sent me back a reply, so I surmised that my guess was correct.