As long as reduced sperm count articles due to the wearing of Speedos and other tight clothing continue to be written, the "good old days" will never return. I first recalled reading about it in the mid-1980's. The perception by women I've known is that the wearing of Speedos is less masculine (having qualities or appearance traditionally associated with men, especially strength and aggressiveness) due to it weakens their sexual reproduction capabilities.
https://www.inverse.com/article/3510...ce-sperm-count
The author of this 2017 article is a woman...Eleanor Cummins.