I think everybody here agrees to two facts:
1) A man must be attracted to his wife. Therefore, he should date girls he finds attractive.
2) On the other hand, a man cannot, as sac put it, be an animal. Looks should not be all he cares about.
To find the perfect middle ground here is not easy, and it varies by the boy. Therefore, I think this is a personal issue that should be between the boy and his Rebbi. I do not think there is a black and white, all across the board answer here.