Female goldens live a much more secretive live than males. Thats why 99% or more of the imports are males. Juvenile and inferior males do mimic females to avoid agression of the big males and then they VERY much look like females. So many specimens in the pet shop do look like females but later turn out to be males.
I know people who have been looking for females for many years and aquired a lot of female looking specimens. MOST of these later turned out to be males.
Differences between sexes are slight and only obvious in fully mature well nurrished animals. Heads of males are broader and preanal pores more pronounced. A well supplemented female has visible calcium sacs at her cheeks, but sadly such females hardly ever appear in the trade.
Goldens are calm, semidiurnal lizards. But intraspecific agression sadly is high. Even if you find a female, you may be unable to keep her together with the male. Manyx males tend to dominate the females strongly and prevent them from eating. So the female produce some clutches (and the breeder is happy and thinks all goes fine)and then die from lack of minerals and food. Hence a pair which is kept together needs very close observation.
For the same reasons, I would not recommend trios or larger groups. Best way to keep them is a single animals which are introduced to each other every other month for two weeks. This gives enough time to mate but normally is too short to stress and starve the females too much.
If you are lucky enough to have eggs, incubation and raising of the babies is as easy as for tokays. Also parents do normally not eat their babies.
For a single animal I would recfommend a tank of 2 x 1,5 x 3 ft, preferably bigger . A heigth of 3 ft should be the minimum. In significantly larger cages you may try to keep a pair together-if you find one. Goldens are much more diurnal if the lights of the tank are relatively dim. Bright metal halides normally lead to strictly nocturnal goldens. If the cage is furnished with only fluorescent bulbs, you will see the gex much more often at daytime . They also love to bask under mild lights.
Hope that helps
Ingo