in one episdoe I heard marion say it ws her job to talk to joanie about sex and howards jobto talk to riche but whats wrong witha mother and son talking about sex my mother useto talk to me about it so whats wrong with it

These are the Happy Days, besides discreet mentions of "frisky" activities, sex, drugs, alcohol (well, in the later eps anyway) or anything else Nancy Reagan would find unacceptable (as Luke whatever-his-last-name said) was not mentioned on Happy Days.

Well, it was the 50s, and its usually common that Dads tell the sons, and Moms tell the daughters.

Howard told Marion he was stilling waiting for his dad to talk to him about sex.

yeah I know but is ok fora mother to talk to her son baut sex or not im not trying to be rude and im not mad butis ok for a mother to talk to her son bot sex or not

Well, it makes sense for the father to talk to the son about it, and the mother to talk to the daughter about it. It wouldn't really make much sense for a guy to tell a girl about sex, or visa versa, because both sexes have different points of view in it (or atleast I think so)