We'll go with: Ya either got it or ya don't!
Bill- 99% accurate, tried, tested, confirmed over DECADES.
Chuck- 90% INaccurate, tried, tested, FAILED over decades.
Having said that, there are certainly things you can do to "hone" your gaydar. But at the end of the day it's a matter of any aptitude and you either have to have the foundational aptitude or you'll never get to real proficiency. Like a virtuoso pianist has to be born with the aptitude THEN have years of practice to achieve the true proficiency versus a good piano player who isn't a virtuoso, didn't have the aptitude but worked HARD to attain the skills and can play decently but not with awe-inspiring results. Such is gaydar..... in our opinion.