The age of consent in Ohio is sixteen for purposes of sexual conduct/contact (http://codes.ohio.gov/orc/2907.04). However, you could be charged with contributing to the delinquency of a minor if you cause her to become unruly (not follow parents' orders) or if you cause her to break the law (such as a curfew violation). Also, do not take photographs of her nude or encourage her to send them to you--you can be charged with manufacturing child pornography.
What you mean by "date" will determine whether your conduct could be criminal. If you are thinking movies and restaurants and shopping sprees, then you are okay.
If you have any questions, feel free to contact me. My firm's website can be viewed at www.francelawgroup.net.
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