i read the research paper; there are three giant flaws 1) the orientation of the participants was not taken into account nor mentioned in the paper; 2) there was no double-blind; & 3) the sample is much too small.
given that, i think that there are certain things that give us hints when we meet someone that makes our ‘antennae’ go up but there is no real proof until you ask!
oh, though the study that a longer ring finger than index finger indicates a man may be gay certainly has some merit!!!
[please. my tongue is in my cheek...]
but, then again, what about the one that the counterclockwise sworl of a man’s hair at the back of the head may have something to it….