Open bottles
Rob,
You are confused. An open bottle can very easily create an accidental vacuum and get stuck. There is a lot of loose skin in a vagina that can easily cover the top of the bottle and create a problem.
Also, it doesn't matter about the small size of the "larger" end. It is still extremely small and can easily go in and out of almost any vagina. It also looks better.
There are many reasons to not put and open bottle into a narrow opening. It can easily cause problems. If you want to use the narrow end of a bottle, you have to cover it to prevent problems. You should know this from over ten years of doing this stuff, except that you don't use bottles.
/Joe
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