As an employer, it is your duty to prevent any kind of discrimination or sexual harassment within the workplace. Sexual harassment is defined as any unwelcome sexual advance or conduct on the job that creates an intimidating, hostile, or offensive working environment. Any conduct of a sexual nature that makes an employee uncomfortable has the potential to be sexual harassment. With the definition being so broad, you want to make sure to do as much as you can to protect yourself and your employees. One way to do it will be to adopt a clear sexual harassment policy that you will include in your employee’s handbook and then make sure that you train your employees as well as your managers. The key thing is if and how you respond if someone does report that they have been harassed. It is essential to respond in the first instance and insure that they matter is appropriately dealt with. How to deal with a specific complaint is a bit more complicated.
Regarding discrimination, you might want to keep in mind that in addition to federal laws that prohibit discrimination on the bases of race, religion, age, etc., there are also state and local laws that can prohibit additional discriminations such as sexual orientation. Make sure that you do not discriminate on that basis against any employee!