The reasons they cite are anatomical.
Flexible plugs of silicone are also going to be less likely than glass or metal to cause damage Remember! Emergency room trips to get a toy out of your rear are embarrassing for everyone involved.
Also, consider using a to get more of the good stuff further in.
I find two main principles apply to being able to stay plugged, well, virtually all the time.
View Shemale Buttplug Pics and every kind of Shemale Buttplug sex you could want - and it will always be free! The overall plug—egg, shaft, donut—are configured with a slight curve, which follows the natural curve of the rectum, and the donut sits between the butt cheeks like a coin in a slot; that is, it is parallel with the butt crack, not perpendicular to it.
The curved base is made to fit more snugly between your cheeks, giving it a comfortable, firm anchor for long-term wear.
If you must use a or a with your toy, remember to remove the plug and reapply the lube throughout the day.
When you are ready to move up, you already have the the next size ready and waiting.