The problem with the OP's question is that they are basing it from completely incorrect information. There was never a time ever when the only thing acceptable was "your typical vanilla sex between a married man and woman". Never. There are some groups who would like to THINK that is the truth, but it never is, and never was, and god hopes there never will be, because that is the sort of thought and behavior control that we should never ever hope to have.
What people choose to do sexually, with whom, how often, how many and in any variation of consenting adults is absolutely no business of anyone who is not involved. Anything else is people sticking their nose in where it doesn't belong and isn't welcome.
What people choose to do sexually, with whom, how often, how many and in any variation of consenting adults is absolutely no business of anyone who is not involved. Anything else is people sticking their nose in where it doesn't belong and isn't welcome.