Plutarch, The Life of Cato the Younger 7

When he thought that he was old enough to marry—and up to that time he had consorted with no woman—he engaged himself to Lepida, who had formerly been betrothed to Metellus Scipio, but was now free, since Scipio had rejected her and the betrothal had been broken. 

However, before the marriage Scipio changed his mind again, and by dint of every effort got the maid. Cato was greatly exasperated and inflamed by this, and attempted to go to law about it; but his friends prevented this, and so, in his rage and youthful fervor, he betook himself to iambic verse, and heaped much scornful abuse upon Scipio, adopting the bitter tone of Archilochus, but avoiding his license and puerility. 

And he married Atilia, a daughter of Serranus. She was the first woman with whom he consorted, but not the only one, as was true of Laelius, the friend of Scipio Africanus; Laelius, indeed, was more fortunate, since in the course of his long life he knew but one woman, the wife of his youth.