Except for the fact the femaliens in 2069 aren't studying males but looking to extract the necessary 'essence' for procreation, as it were, and I don't recall them ever getting into the sauna (there were a few sauna scenes though) to talk and it's a sex farce which most definitely qualifies it as sexploitation, IE: softcore porn, I'd say sideorderofninjas guess is probably right.
However I do love a excuse to make screencaps. Do these pictures seem familiar:
The movie is from 1970 so it at least fits the general timeframe.