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Have they actually punctured? There was a hole that needed a repair? It's not clear from what you've written.
Not the fault of the tube: latex is more puncture resistant than butyl.
If not, as miro_o says, it is just that latex is more gas permeable than butyl and the higher the pressure the greater the rate of loss.
As for the pressure, it's not simply dependent on the size of your rims and tyres (they're not 25c BTW): are you fat?
Scilly.Suffolk
So. Latex tubes. I started using them the other day but I've all ready had two punctures. Am I being stupid or something? I've kept my rear tyre at 90psi, which should be okay, I believe, for a 25c on a 23mm rim. Though it is the rear that has punctured twice. There is no visible evidence of a snake bite, or a cut or any other kind of hole on the tube yet they're not holding air.
I think I will go back to butyl for now...