I see no problem, and should be no stigma attached to riding a step-thru frame. I can see many reasons why a step-thru would work better for some, as opposed to a horizontally top tubed bike. That being said, if you opt for a step-thru, just check that is isn't a "women's specific design". My wife's traditional horz.top tubed road bike is a WSD, and there is definitely a difference. It is geared to a shorter torso, longer legs of typical female anatomy. Works great for her, wouldn't work so great for a man with longer torso and shorter legs, as compared to a female of similar height.