Hi lgreenmk,
I have two Angels which I believe to be both males. They do fight regularly but they always stick together, they also lose their colour and are very shy when I seperate them. I wouldnt recommend two males tho if I were starting over, one is usually battered and bullied constantly.
Its very difficult to tell the sexes apart except when they are spawning, when a tube appears on the underside of the fish, on males its short and pointy and on females its thicker and blunter. Like a pen nib v a thimble.
Some people think you can sex them by the angle of the anal fin where it meets the body, a lot of people find this a little suspect tho!
A mated pair is the best combination but as you dont want babies this is not ideal. If its for a community tank, the fry probably will do very well to survive and most domestic angels tend to eat their eggs for the first few times. It couldbe a little upsetting to see the tiny fry dying tho...
Ken