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The dismissal of a sexually selected trait just because it usually is far more pronounced in one sex than the other seems extemely premature to me.
I would argue chins are actually already quite different between the sexes - to the point where people will have surgery to change their appearance if their chin doesn't conform to societal ideals.
Sexually selected trait seems like an avenue of research that shouldn't be so easily dismissed.
This is, like, an undergrad project.
work with the depressed grad student who is good at stats to determine the parameters of your experiment at the outset and calculate the number of subjects and stimuli for statistical power; pay in marking or research help.
get an appropriate number of headshots from undergrad males for stimuli, give them intro psyc course credit for participating.
work with mid-degree graphic design students to give all headshots 3 levels of chins (low, normal, emphasized), ensuring none are comical; the the psyc grad student signs off on the work as portfolio credit
have an appropriate number of undergrad cis-het women subjects rate a your lineup for attractiveness; intro psyc course credit for participation
analyze the results to see if low chin is selected less than normal or emphasized.
submit your research paper and results; get your 4th year class capstone. Grad student takes your work and adds it to their dissertation, you get a footnote.
I'm sure this has been done...
I don't have a source on hand, but I'm sure that a pronounced chin has been found in studies as male attractiveness symbol