Normal female x lutino male
100% normal males split lutino
100% lutino females
Normal female x normal male split lutino
50% normal males
50% normal males split lutino
50% normal females
50% lutino females
Lutino female x normal male
100% normal males split lutino
100% normal females
If you could find out your cockatiels parents, it *MIGHT* give you a clue on sex.
Lutino cockatiels can be sexed just like any other mutation out there with the wing and tail methods unless they are medium/heavy pied as well. Pied being the only mutation that is anti-dimorphic, meaning that males and females can retain immature coloration and the pied feathers do not show any markings on them whatsoever.
Pictured below is an immature, DNA sexed male lutino. Since he still has his baby markings, you can easily see the stripes on the tail/rump feathers, as well as the spots on the flight feathers. (sort of)
Without more information, we cannot figure out your cockatiel's gender. For now, it would be easier to determine gender based on personality and vocalizations. Males tend to be more vocal, knowing more chirps, where-as females tend to be quieter and have less chirps.