(poor Gene. i'd hide too, if people called me that.)
A study of nearly 200 Dutch men found those who climaxed too soon during intercourse had a version of a gene that controls the hormone serotonin.
Men with this version ejaculated twice as quickly as other men in the study.
Serotonin levels are what control the rapidity of ejaculation, say the Utrecht University researchers told the Journal of Sexual Medicine.
...
She said men with primary premature ejaculation tended to be fast reactors generally.
"These men have very quick reflexes. They may be excellent at playing tennis or computer games, for example."