I wouldn't know about that. All I know is that there are objectively attractive guys breaking their back on construction sites but I've never seen a gorgeous woman working night shifts at gas stations or doing double shifts as a cashier.
The night shifts thing might be getting at a counter-point if you consider why a gorgeous woman might not work night shift at a gas station. I've also never walked into a gas station late-night and been greeted by George Clooney behind the counter. Also, I've seen plenty of beautiful cashiers and I'm sure one or two of them must have done extra shifts at some point.
Had a class mate in highschool, who was real eye candy. As most pupils that age, she worked a part time job. Hers was in a bakery. She literally had a modeling agent scout her during her shift. She didn't immediately accept the offer but she sure as hell stopped working registers.