What IS it About Jessica Alba?

I have been wondering for quite some time why the guys are all nuts over Jessica Alba. I mean, yeah, she's beautiful, of that there is no doubt, but so are a hundred other actresses in Hollywood, models in New York, and women who are famous across the world. THEN, when I went searching for this picture of her I saw some REALLY racy pictures and it helped me to understand a little bit better what the big deal is. When your ass in in the air and you can see everything but your monkey men are prone to pay attention.