Genesis 29:30-32

"Then Jacob also went in to Rachel, and he also loved Rachel more than Leah. And he served with Laban still another seven years."

"When the Lord saw that Leah was unloved, He opened her womb; but Rachel was barren."

"So Leah conceived and bore a son, and she called his name Reuben; for she said, 'The Lord has surely looked on my affliction. Now therefore, my husband will love me.'"

(And this continues for several verses with various women.)