I did a similar experiment but it was initially by coincidence, I was extremely skinny before I ever touched any gym, after I went to gym and got some muscles, i replaced my okcupid pic with a shirtless beach pic; and boom....the messages, at least the replies, skyrocketed.
This is an old and long thread: viewtopic.php?f=6&t=200381
but these screenshots proved it all:
Notice how in the older screenshot, there was so few "New messages" , most okcupid notifications were the "New Matches" which are sent by their bot regularly every x days - notice the huge time gap between one message and another in the Before screenshot.
The_Face_of_Boo wrote:
Some comparison of before vs after
BEFORE THE SHIRTLESS PIC (notice the huge
date gaps), and most of them were e just "New Matches notifications"- even tho probably some of the old message notifications were lost in the spam folder i guess but this still reflects the gap rate:
JUST AFTER THE SHIRTLESS PIC (was posted on May 29)

Good day, lads and gentlemen.
It has been proven many times and times again that women are as visual as men when it comes to dating.