In defense of premature ejaculation

…assuming that ejaculation is not so premature that it occurs prior to intromission and sperm cells find themselves awkwardly outside of a woman’s reproductive tract flopping about like fish out of water, what, exactly, is so “premature” about premature ejaculation? …wouldn’t there likely have been some reproductive advantages to ejaculating as quickly as possible during intravaginal intercourse—such as… inseminating as many females as possible in as short a time frame as possible?