Tuck in... or not to?

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I am a guy and I've always been wondering whether to tuck in my shirt or not. Some people think that tuck in the shirt will actually means formal, professional and maybe gentle. But some might think that tuck in the shirt might be a little bit old fashioned and prefer to let the shirt stay at the outside. Without tucking in the shirt, they might feel like modern, trendy, or somehow younger. So readers, share your point of view in this, especially the ladies, let the guys know how the girls actually think about this.