I have experimented with bananas a bit and thought some of you might me interested in the method I have found best for me. Frozen works but is a bit intense for some time while the melting takes place. A bit yellow works but the rather hard bananas don't seem to adjust and move further up. It is hard to take more than 1 or 2.
What I have found to work well is to get a bunch of ripe bananas. Not over ripe but about the way you would like to eat them. I take a enema or 2 before playing with bananas both to provide room for them and to get the benefit of a "clean" expulsion when I am done. Next insert something in your rear about the diameter of the bananas and leave it there while you peel the bananas, cut them in half, and otherwise get ready. The thing in your butt needs to be in there 5 minutes or so. If it is not convenient to lie down and you find it is dropping out you can put on a pair of fitness shorts or something else that will hold it in. A butt plug will not work well because it necks down at the anus and will not hold you open enough unless it is a giant one. I find a vibrator is about the right diameter and works well.
What you are doing is relaxing the muscles in your anus so that they will be willing to stay open for a brief time when you pull out the vibrator. You will also be lubed up for the 1st banana. The bananas should be cut is half both to provide a flat end to push on and so they are not too long -- more later.
When you are ready assume the knee chest position to open up your cheeks, remove the vibrator, and quickly insert the 1st half banana. You may be surprised how easily it goes in. Next, carefully and gently slide the vibrator back in. This is doing 2 things -- it is keeping the muscles in your anus relaxed and it is repositioning the banana so there is room for the next. You need to insert the vibrator quite far so the portion inside the sphincter is at least as long as the next half banana.
You can now remove the vibrator and insert the next banana. After the first 2 or 3 pieces getting the vibrator back in will have to be done slowly and carefully to allow the ones already inside time to reposition further in.
I have done 8 half bananas and stopped because I ran out of bananas. I suspect that I could have done a number more if I had wanted to but there was not much point. After 4 there is a considerable feeling of fullness.
What you do next is up to you. There are many options!
Hope this helps some of you.