This Valentine's Day, more of us than ever will be looking for love online. And if recent studies are any guide, relatively few women on mainstream dating sites will bother to respond to overtures from men of Asian descent. Likewise, black women will be disproportionately snubbed by men of all races. Yes, even though America has been flirting intensely with a postracial label for some time, color blindness is not upheld as an ideal in the realm of online romance. On some sites, it's not even an option.