How to find the gender of a love birds?

hey this is the first i have heard of. well never really thought about it but i guess it has something to do with their beak hhehehhehe i could be wrong yai.

I just got a pair also well igot the om and dad with baby LOL , any who from what I see and was told is that the female is not as colored on her fce mine is peach face one and she has more grey tones ( as does the baby) but the other one has no grey and has practicly a solid orangeish face , what I love about them is that i dont have to put eggs in a lil dish for the baby like i do with my finches ;) just keep them watered well and fed well lol , Im told parakeets are the same way ! so it great tho i need to find a home for the baby since the momma had ore eggs and is setting :O how long do they set? ~M~