They may produce seeds but it's rare and they are very hard to harvest.
If you're looking for propagating your plant the best thing to do is take stem-tip cuttings and root them. (It's fairly easy!) Plants started from seed will take often-times 7 yrs to flower; plants from rootings will flower in less than 12 months. (Books state 12-18 months but I've had them flower in 6 months. However, I have a heated g-house.)