I don't have exact proof. This is not an exact science and everybody has their own point of view. I have my own point of view and it's this. But I am a good example. Around 90% of my dates have not gone well. I show up with less hair density than advertised on my photos. My photos were taken in deceptive lighting to make my hair look better. Additionally, people look at my photos with a buzzed head and a built physique, and expect me to be 6'0" or more. I've been told this numerous times. Of course, I'm not close to that height at all.
Moreover, if you look at the guys doing well with women and compare them to yourself, you will find that they don't necessarily have that much going for them. They have a good head of hair and they might be a little taller than you. They typically won't be in much better shape, won't be considered much more intelligent, won't be a top earner etc. etc. But the hair is enough. That's how it has been for me. So if it's not hair and height, what could it possibly be?
What is the height of girls have you dated/liked/loved?
If you are 5 feet 8 inch,ignore 5 feet 5 inch and above height girls.