How do you determine a male lutino African lovebird to a female lutino African lovebird?

The males will have brighter colors then the females. If you have a closer look, you can tell a slight different color tone to them. One well have brighter colors "males" lighter colors mean "females". I get these birds all the time. And I have noticed that there will be to together. Male, and female. Just look at the color difference and if ones brighter and more colorful it means male. Hope this help.