You must be thinking what cheating has to do with summer. If a person wants to cheat, he/she can ditch anytime whenever one finds someone more attractive. Or if the person is loyal, he/she will be loyal irrespective of any other attractions.
But this claim has come out of surveys where women themselves have admitted their intention to get indulge or intimate with some other guy specifically during the summers.
During summertime, you are more likely to take off from your work, you are in a relaxation mood and therefore, you feel a little free and less tired to your obligation.
Summertime gives you a childlike feeling which makes you think that you can just sit and relax like you did it in childhood. Plus do something which can give you a break from your daily life as well as gives you pleasure doing it.
So guys, beware of your lady specifically in summers, give time to her as much as possible.
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