If someone reported to You that They were sexually harrassed, I think you have to report it to someone above you. If someone came to you in confidence and told you something that happened, maybe they wanted an opinion of what happened to them to see if you thought they were over-reacting. Maybe you need to ask them what they would like you to do. Make others aware of it, or just to give you a heads up.
Actually I have never seen a man be sexually harassed.
And I think most women( At ups) are above being bothered by it if it doesnt involve losing their job if they dont perform places other than work, if you know what I mean. And that is more threat than sexual.