Plenty of nuns leave convents if they come in contact with a man, they find attractive. I knew even one who went for a true Dark Triad Alpha - became a killer later and was shot by the police.
Nuns come in all shapes and sizes. Many are low-sexual-market outcasts, some are truly desirous of spiritual growth, but later find the environment too stifling. A very few are truly spiritual and so strong in their faith, that nothing would change them from the path. This one was a late-stage convert carousel slut, who just hibernated her sex-drive for a decade. Then it came roaring back and she went full retard even boasting about it for feel-goodz.
Nothing to see here - normal female nature.