Go to any of the 'feminized seeds' threads for an explanation.

It's going to be a bitch to get enough female flowers on a male plant to use it for seed production.

It's all too easy to end up with male flowers in a female bud.
And voila! The plant pollinates itself. Snap crackle pop.

So I think the answer to your question, can you use your males for seed production, is that it's not really practical.