The most progressive societies with regard to sexual integration are probably The Netherlands and Scandinavia. They (again probably) have the least leering, ogling etc. On the other hand, sexually segregated societies (think Saudi Arabia, Pakistan etc) have horribly misogynistic cultures.
So, the idea that unisex changing rooms will reduce ogling etc is not some far fetched idea, it is kind of in line with what a lot more progressive societies think of as normal.
Two things. Firstly you say probably they have the least leering and ogling but that's your guess rather than an evidenced fact.
If it were true it's likely to have far deeper causes than just unisex changing rooms. Without understanding and replicating those deeper causes it would surely be folly to expect the same behaviours.