Dunno what's the correct measurement
If I measure from above by pushing a ruler to the bone, it’s about 17-17.8 cm / 6.7-7 inches. Doing this creates a little pressure, but not much. However, ruler’s surface area is very thin on ends, so it actually reaches bone.
I if use some wider object with flat surface area, like 15 cm / 6 inches flashlight (probably an inch wide), it really isn’t an inch shorther than my penis if I push it it to the bone. Maybe close to half an inch. This is because I’m too fat, probably 35-36 bmi.
The third way is the skin measurement, which is difficult for precise measurement when you’re fat, but I would say it’s about 14 cm / 5.5 inches. Sometimes a little longer when I get harder-than-normal erection.
Dunno really is the most corrent measurement. I’m not talking about measurements for PE progression, because I’m not doing any PE’s now.