People with Machiavellian personality traits, also known as one of the dark personality traits, are extremely cynical and like to exploit others. While they can be charming, they are definitely not the type of person you want to be intimately involved with.
New research examines how Machiavellians approach sex. Overall the picture is bleak. Machiavellians use sex not as a way to foster intimacy, love and affection. But, they are more likely to use sex as a means for achieving their own personal goals such as revenge, increasing their status, gaining resources, or simply as a physical release, just to name a few.
And it should come as no surprise that Machiavellians are also more likely to engage in sexual lies and are prone to infidelity.
Source: Brewer, G., & Abell, L. (2015). Machiavellianism and sexual behavior: Motivations, deception and infidelity. Personality and Individual Differences, 74, 186-191.