I guess you never saw Elaine and Puddy go to a priest for their counselling. He told them, in no uncertain terms, that they're both going to hell.
Of course the show reflected the largely promiscuous society in which is was set. But none of the characters moral shortcomings went unpunished.
They approved of abortion so much that everyone simply agreed not to eat at some Pizza place because the owner was against abortion.
You obviosuly missed the glee with which Jerry loved testing Elaine's newfound committment to only supporting "pro choice" people. From inquiring of Poppy in the middle of a meal in his restaurant, to asking about the status of her new boyfriend, the mover.
Again, for those who didn't seem to get the memo, these characters are not put out there in order to emulate.
SD
Actually I couln't think of better examples to make my point.