closed for good last month <| sep |> I am in HR . If you have decent HR ppl , they will absolutely investigate and take action whether or not you want anything done about it . It ' s funny when people come to me to report something serious and say but I just wanted to let you know , I don ' t want you to do anything about it . I will keep things as confidential as I can for the people involved but it doesn ' t affect my obligation to take action . You should still tell HR because this isn ' t OK to put employees in this kind of situation . Now you are worried about the potential fallout affecting your job and that ' s exactly why this is not OK . Also , it ' s the having sex at work part that is not OK , regardless of genders involved . I ' m guessing this was probably another employee in the shower too . If down the road this ever became a lawsuit , your lawyer would absolutely make sure it was known you told HR and they did not investigate .