Just looking at those absolutely yummy breasts is exciting to men. Women's breasts are the object of something that falls in between strong interest and out-and-out obsession, depending on the guy, and of course the set of tits we're talking about. They make us fixate, lose our train of thought, and even do double takes. Girls say that they make our eye contact stray during the most innocent conversations, make us sigh involuntarily. And even make us gawk. Yes, it's biological, and yes tits are sexy, and here's a perfect example of why: Sienna West!