Originally posted by
how easily does glass with some girth, say 4 3/4", insert vaginally compared w/ other materials?
It depends on what you mean. Smooth glass toys have very little friction/drag associated with the surface, and even less with any lubricant. So in that sense, a glass toy would likely insert more easily than say a silicone toy.
If you are basing it on size, an equally sized glass dildo would potentially be harder to insert than a silicone of the same size because the hard material has no give whatsoever.