So I just did some research, and Dascyllus damselfish (I'm assuming your fish are Dascyllus melanurus) are protoginous hermaphrodites, meaning females can develop into males.
A 'pair' of damsels really just means that the male won't kill the female, she still isn't allowed anywhere near his territory, except to spawn.
As for getting them to spawn, I would add some live blackworms to their diet. This got both my clowns and damsels to start spawning.
I had a spawning pair of Dascyllus trimaculatus and those guys where with around 5 inch huge (and meaner than junk yard dogs).
I got them for free and only took them because they were spawning. I kept them in 1000 liter tank in which I stored live rock (I wasn't crazy enough to put them with other fish).
I wouldn't expect them to spawn until they haven't at least reached half to 3/4 of their maximum size of 4 inch (nor would I look forward to that if I had other living things in the tank).
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