Butt plug too small?

Hi, I'm a beginner in anal toys and I wanted a butt plug that I can walk around with. I researched butt plugs for a while and it seems like most people agree that a diameter of 20 mm is a medium butt plug. So I bought a 20mm butt plug and when I tried to insert it, it went in no problem. No resistance at all. I hardly even felt it and couldn't keep it in easily. As soon as I move, it just goes out. Is this normal? I would not want to buy a larger one, just to incur in the same problem 😢

I take it 20mm is close to 7/8 of an inch. Way too small for me. I'm no size queen, but my first plug that I felt comfy wearing out and about is 2 1/8inches. However the same plug would probably work great down to 1 1/2 inches. The shape matters a lot. My plug is at about the limit that I can insert in one steady motion...if that makes since. I don't to have stretch and get used to it before putting it all in. (Not completely inserted. the ball is still out!) I thought I better clarify that!

Sorry I mean 40 mm.

I agree with ozzy. This sounds like there is a flaw in the design/shape. 40mm diameter is quite typical. If you reply with a link to the plug you bought, I might be able to point out some things about the design that may explain why it did not work as intended.

Link: https://cdn-img-3.wanelo.com/p/3db/2f8/674/82d62e6c8189e6c3f627aa6/x354-q80.jpg

I would guess the neck of the plug is not quite long enough for you.

Are you sure that the plug is indeed fully inserted? You should feel your sphincter close up around the neck of the plug once the widest part of the plug has passed the sphincter. On a tight arse not used to anal play, that feeling should be quite pronounced.

It is possible that, while you think the plug is fully inserted, it is actually not quite.

Are you using any lubrication?

Judging by the picture, that is a very short plug. It looks like maybe 3 inches total, correct? Most plugs are somewhere between 4 inches and 4.75 inches in length.

I solved the problem. I just kept it in for a minute or two manually and then I could keep it in with my sphincter. It looks like my sphincter is "retarded" and takes some time to fully close.

That does not sound like something that should happen. I recommend trying some different types of plugs. This one is probably the best (and lowest priced, if that matters to you) I have found for beginners:

http://huse.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=HDC&Product_Code=218102&Category_Code=A3#.VfHx1LTrtUQ

I have no affiliation with the above site.