Congress rather suggests that this was originally an American text. I have never met a British person who talked of sexual congress, only Americans.
I don't doubt, OP, that this text may well have been printed in the 1960s, but like many others I suggest that it was an older text, brought up to date by mentioning "rollers" instead of "curlers" and otherwise served up as it had originally been written.
It could be pre-WW2 or written in an attempt to get the women who had gained some monetary independence by working in munitions factories, or joining the services back to the pre-war role of homekeeping wife, supported by husband.