I don't have a rooster in the current flock, but with the in-town flock:
#1-5, The Red Boys
I assumed that my packing peanuts would be male and once they got old enough to be sexable I put photos on the forums here to confirm. Yep. They were.
#6, Marion (formerly Rosemary)
It was the hackles and saddles that made me suspicious that my only Light Brahma in that flock was a boy. I remember handling him and looking at his hackles across my fingers to see the true shape of the feathers, not just the shape of the color pattern.
But I was still able to hope that he was a hen up until a week after The Red Boys went to freezer camp.
Then he started crowing.
We let him stay because he was beautiful, docile, and had a lovely, deep-toned voice.