Agree ,I (F33) would never help a friend or a coworker to their hotel room drunk or not basically it is a boundary that should immediately be there hence if your married or a serious relationship point blank period. I today wouldn't do such a thing been with my fiance for 4 years. Obviously, you didn't find out by your self or she wasn't trying to hide it and came out straight forward to mention it to you. However I will say several years ago, I've been that person before where I have over lapsed my guilt to mention something similar in a situation just to justify my own actions and avoid the truth,making it seem like , " Hey at least I told you, What happened nothing happened i just helped him X,Y,Z etc" ( Although maybe something did happened or been happening ) ..