I may be getting monkey studies mixed up, but we seem to be saying: a. A wheeled toy is for boys and b. A plush toy is for girls and c. Boy monkeys like wheels or dislike extended plush toys. We can't be sure which.
It would seem to me that human boys do not like wheels more than girls do - popular wheeled girls toys are mini prams, mini pushchairs, rollerskates, bikes, shopping carts, barbie on a bike, push along animals,, barbie cars, disney princesses on rolling feet in a giant fairy dance studio. I see no evidence that boys spend more times on wheeled vehicles. I also see no evidence that young girls play with plush toys more than young boys do. Teddies etc are unisex toys for young children,, as are other soft items like security blankets.
I don't know why boy monkeys prefer wheels to plush, but i also don't see that it has a relationship to humans.