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				Originally posted by AlethiaSi  
yes, your pupils dilate as your brain and senses are aroused (lol) by looking at things that are pleasant to you.  This also happens when you are around your friends and people that you care about.  Its studied by psychologists learning about liking and what makes people more attracted to other people for friends or mates. 
			
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 Yep, it allows your sight to become sharper AND, like you said, the deepening of the eye is a primal sign of openness that encourages mating!!! Look at felines - they really do it right.