Insertable length.
Insertable length.
Insertable length experiment.
I took a glass tube and plot scale on it.Tube around 0.5" wider than my willy at the base.
Then I pushed my penis into it to see how far (deep) I go.
Surprisingly, even with my penis curvature, I managed to reach my BPEL of 7", even more when I pushed harder.
So, I think BPEL make sense after all.