Na mootram phenilam yasya vishtaa chaapsu nimajjati
medhraschotthana shukraabyaam heenas sa kleeba uchyate
The texts of ayurveda mention few preliminary physical tests to determine the potency of men.
A man can be said to be devoid of Impotence or erectile dysfunction – -
If foamy lather forms when he urinates on ground in sitting position.(This determines the muscle tone)
If he gets good hard erection.
If his ejaculation is powerful and with good quantity of semen.

