Yes it really exists and has for a long time. As a none pretty woman who is friends with a very attractive woman I know 1st hand that is exists and is going strong. Strangely it's not just men either, she has women bending over backwards for her too. We've even tested it out before just to check, on one occasion we both went into a local repair shop her with a pushchair that's wheels were damaged and me with a pushbike with a broken chain and flat tyres. Not too dissimilar to repair...We went into together but not acknowledging each other. She was seen to first, 3 men appeared all very keen to help with the pushchair and offering her advice with smiles and niceties. They said they could do it then while she waited and would take about 20 minutes.
My turn came, one miserable looking bloke came out, told me I'd have to leave it and come back in 4 days. No other help offered, no smiles and just one man.
Another time which didn't start as a test... Her car had broken down and were stuck at the side of a fairly busy road waiting for the AA (or whoever she'd phoned) and as a smoker at the time I was stood near the car, my friend was sat in the car. Now I didn't expect anyone to stop and help but one car did, the bloke asked if I was OK, I told him yes we were waiting for help. Off he drove.
Then we swapped, I was cold and got back on the car, my friend got out for some air. Within 2 minutes a car pulled up, 2 men inside.. Was she OK? Yes. Off they go. Almost immediately a car with a woman driving stopped, then another car, then another.
I stood there for 10 minutes and one car stopped, my friend was there less than 5 minutes and several cars stopped and most offered her a lift home.
So yes, it's very real.