all greeks was fucking guys in the ass for the excitement , and fucking women for reproduction.
As for 300, frank miller choosed the spartan's look by looking at some greek painting, showing the hoplites fighting naked. But those painting are showing hoplites during training.
Spartans were wearing either bronze chestplate, or linothorax (tightly put together linen) with sturdy bronze helm, oak shield and leg guards
picture showing linothorax