Although it has been deemed irrelevant to address ejaculation time in
terms of mean values, our study was designed as a preliminary step in
determining the normal range of ejaculation time (from the start of st
imulation of the erect penis to ejaculation) as a criterion for assess
ing the degree of ejaculation disorder Ejaculation experiments were pe
rformed with informed and consenting healthy volunteers about 20 years
of age, using identical manual stimulation by the same woman, and eja
culation time was measured. The mean +/- standard deviation for the ej
aculation time was 156.5 +/- 80.7 seconds, which was shown to be erect
ion time dependent.