…
The level of erection hardness is measured in a scale of one to four using the Erection Hardness Score (EHS) developed by the European Association of Urology.

“Level one is like tofu where the male organ is large but not hard, level two is similar to a peeled banana where it’s not hard enough for penetration, level three is like an unpeeled banana where it’s hard enough for penetration but not completely, and level four is similar to a cucumber where it’s completely hard and fully rigid,” explained Dr King.
… more

read more:
Malaysians not so hot in bedroom
The soft findings in sex survey
Pfizer Launches New Diagnostic Tool for a More Focused Treatment of Erectile Dysfunction