So I'm sitting around 5.5 in (140 mm) in length. I've never bought an onahole before, and I need some help in deciding how long the onahole cavity length should be at minimum. I've heard that because they're stretchy, it's perfectly fine to go about an inch (25 mm) under. But I'm still kinda sketchy on that. I want to put my shaft all the way into it. I've also heard that it's perfectly fine getting one longer too, the only downside being you don't experience everything, ahem womb penetration.
Specifically, what are your experiences and opinions on onaholes that were shorter than your penis length? What about those that are longer?
Your opinions?