Aries is a true womanizer. His potential and libido prevent him from being with only one partner. He is not a faithful person, and he certainly cannot hide that he had cheated.
Taurus has enormous sexual appetites. If he is not satisfied with his partner, he will seek for consolation in others, without ever turning back.
Gemini can be very selfish when it comes to emotional relationships. They never question their own freedom, and they don't think their adventures should be something worth mentioning. But, they can be very jealous if their partner does the same thing.
Cancers, allegedly emotional types, are those who will stab you in the back. You will never understand their double standards, and be sure that what they do when you're not around is nice at all.
Even though being a passionate and potent man, Leo is faithful to his partner. The reason for that is that he thinks he made the right choice. His partner has to be the best, just like himself.
There are two types of Virgos- those who are completely faithful and those who are almost promiscuous. For the latter, the act of adultery has no weight, cause or consequence.
Libra doesn't know what it means to be faithful. It is in his nature to flirt and to always be likable to others. This is his most prominent characteristic.
This possessive and very jealous sign tends to cheat on his partner. Of course, you will never find out. No one can hide things better than Scorpio.
Sagittarius is a master of cheating. Do not expect romantic and till-death-do-us-part love with him. After a wild night, he goes away. There are so many others waiting for him.
Faithfulness and loyalty are the matter of honor. He cannot understand people in parallel relationships or occasional flings. He thinks that people who cheat are highly unstable, immature, and immoral.
Long live polygamy! Deep in his heart he can be jealous, but he considers life to be one, and he won't live it by the rules.
Pisces is more prone to cheating than to breathing the air. He can be very naive and can get entangled in his own web of lies, forgetting what he had said. Don't believe a word he says.