Also, males have to develop some as well before pollen sacks will open. Males are actually very beautiful in their own right. Basically, if you don't notice the male for a few days, no worries at all. You would still have plenty of time to get them out of there. If he is a good strain, you could perhaps put him somewhere else and harvest pollen for your own seed stock. Though, not many dabble in that, me included.
It is an interesting fact that pollen can be applied to a single branch of your crop, or a few of them, and only these would produce seed, not the entire plant. So, you could flag a branch, or plant as seed bearing, while maintaining the rest of the crop as sensimillia.
-Dude