According to Freud the old cocaine addict,

Frontenders are normal people who reached genital phase and grew a pair.

Backenders are twisted up kids who got stuck at anal phase. They usually have to wear diaper and have been themselves conceived during sodomy and sushi night (which, incidentally, is a perfectly civilized way of spending a Tuesday evening). This peculiar way of being born into life explains one of their most strange characteristics - the fact they poo as much as a terminal phase heroin addict, that is once a year - which allow them to reach the final phase of back-intense evolution. Once they are truly full of shit, they evolve into managers.

I will take no question. Thank you for your attention to this matter