If you are maaried, why do you fantasize about other men/women?

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I'm a married women yet only 25 years old. There are times that I fantasize about making out with other men. Not one in particular, but just a men, I may not even have a face for this men but I fantasize about it. I start thinking why? I have a great relationship with mu hubby, but why all these fantasies. Sometimes I'm so turn on, that I look for my hubby and even he is shock. (too much info,but at least I don't know any of you in person) Has anyone gone through this? Is it normal, is it a booster? :)