Is flirting wrong?

This is a new issue for me. I am not entirely sure why it has come up a lot over the past year. I do not go out to places that would encourage it, and when it does happen sometimes I don't entirely realize it until later. For instance I work outside a lot on the house or rental, and I have been getting a lot of women stopping by to talk to me. Five from the immediate neighborhood and several more that walk or jog by frequently. They would always stop and want to pet my dog and joke about the weather or other light conversation. I have come to realize over the past month that they never stop by when my wife is home, whether or not she is outside. I feel pretty guilty about it when I started to think on it. I also started back at school awhile ago, and their are a few girls that know me from classes together that seem to enjoy my company. It is never more than joking around, I never talk about doing anything outside of the academic setting. I say "girls" because that is how I see them. I am a good decade older than most, so I can't deny they're cute, but at 30 I am not so delusional I think I have a chance. Is this wrong? Am I just asking for trouble? I love my wife very much. Our marriage does have issues, and a big one (for me) is the lack of sex. However we recently had a ,very short, conversation about it, and she might go talk to someone when she is ready. I worry that given the lack of sex, and that my wife knows I am sexually attention starved she might get upset if she found out or saw me joking around with other women. I really don't want to hurt her feelings, but I also want to be myself and enjoy chatting with people. I am the kind of person who knows everyone in my neighborhood, and talk or wave to them all daily.

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