"Disproportionately represented" != "usually", but if you interpret "something wrong" more broadly, e.g. not having several children by age 30, that does seem right (at least in the present-day western world -- I have no idea whether that was also the case in Nietzsche's time, and I've heard it wasn't the case in e.g. the German Democratic Republic).

OTOH by such a broad definition there also is usually something wrong with the sexuality of men with scholarly inclinations, too.