There are several other changes in occupation and
lifestyle that might be expected to impact adversely on sperm production
(Table 0) though, in general, conclusive scientific evidence to confirm this
expectation is lacking. Viewed overall, it seems unlikely that human male
reproductive disorders could have remained untouched by these pervasive
changes in Western countries, though the scale of such changes is
unknown. Before considering the more important factors listed in Table 0,
it is worthwhile considering two other recent developments that are having
a substantial impaa on the way that we now perceive disorders of male
reproductive development and function.