Yeah that's fair, I guess maybe it depends on your definition of "slide right in". I meant it as "there shouldn't be any signficiant resistance to insertion", which was qualified by needing lubrication/arousal for that to be the case. And I guess it should be further qualified that the thing being inserted should be lubricated as well.
But that being said, I am not a woman, so what I'm saying should certainly be taken with a grain of salt.