Agent motivation—why spies spy—is a complex subject. As in the case of Delilah, what seems at first sight to be the reason for betrayal is often not the sole one, or even the defining one. A short list of what appear to be the most common motivations—money, sex, revenge, love, hatred, patriotism, ideology, ego and fear—only scrapes the surface. The answer to the question of why spies spy is only rarely simple and straightforward. However, as with Samson and Delilah, sex can be an extremely powerful inducement, particularly when employed by a woman.
— Read on crimereads.com/a-brief-history-of-sex-and-espionage/