What size proctoscope should I purchase to help straighten my sigmoid colon…

For reference, I use the large Tyson from Bad Dragon and I can’t get it all the way down because it feels like a wall of pressure. I did some research and it said it’s my sigmoid curvature and the Slink is the best toy to correct it. I’d love to know what size would be best for me. If you have other toy recommendations for my practice, feel free to ask!

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