A person who would be perfect for advertising dairy products.
I.E. freakin' innocent and pure in appearance. You would trust him/her to not sell spoiled goods.
Basically, would look good in peasant-wear against bright green hills.
Typically this person has it rough when it comes to romance. Arrogant, controling people want to corrupt them. Nice, good people feel inferior in the face of such wholesomeness.
"I'm such a milk ad! It's annoying! No males will approach unless they wish to corrupt me b/c I look so pure!" she whined to her friend.