Fortunately, I live alone and don't have to hide it. It's hard every morning - something to be thankful for when you get older.
I thought the same thing. However, many years ago when I was finishing college I was living in a studio apartment, staying out, sleeping late, too often alone and usually in the raw. One day, I awoke to a loud knocking on my door. Before I could even process the situation the door opened and in came an old guy with a spray hose followed by my apartment super, a younger rocker type. The older guy seemed surprised I was there, apologized and told me he was an exterminator and that he would be spraying the kitchen and bath and then coming back to the main room, at which time I would have to move so that he could spray behind my bed. I was hard with morning wood of course and with his words I hit the panic button. I asked the super if they could come back in a few minutes. He got very serious and said no, it was their last appointment, they were running late and the complex had already paid for this. He called out to the other guy who was starting to spray in the back that he was leaving and would call him in a few months to set up the next service. Then he turned to me and smiled knowingly, saying something like "and man you have about 10 seconds to get yourself out of this." With that he left, but making matters worse he left my front door wide open to the parking lot. I caught a glimpse of my discarded underwear from the day prior on the floor across the room, so what I needed to do was clear. I don't know why I didn't just wrap myself in the sheet, I didn't think of it, but I decided to shut the door first and then lunge to get over to the shorts and hopefully pull them on before the exterminator returned. That was the plan anyway. I did get the door shut but as I wheeled around to make my move for the shorts the fellow came back around the corner and I found myself standing face to face with him, mostly separated by my hard dick. Apparently unlike most of you, I hadn't been in that situation ever and I never expected to be in it. Totally embarrassed, I mumbled some apology. The guy immediately stopped what he was doing, put his sprayer down, put his hand on my shoulder and said something like "young man, we came into your house without an invitation and we apologize, and may I say you have nothing to apologize for anyway because any man is going to look at that thing and wish it could be his for just one night. So do yourself a favor, relax and be proud." He started asking me about school, what I was studying, etc., making absolutely no effort to finish his work and get on his way and every effort to make me feel comfortable. I stopped worrying about it pretty fast but I was still rock hard if not harder as this went on. I should have grabbed my shorts then I guess but I remember thinking that it might insult him after his nice words and friendliness, plus he really had put me at ease. About then, the door opened behind me and it was the super again, big grin still on his face, "I just had to come back to see how this one ended." The super's eyes got big as he came over and put his arm around me and just kept patting my chest like he was proud of me, repeating over and over "so cool man, so cool." I started to laugh at his reaction and lost my erection pretty fast, The two of them each told their stories of the guys they had known in school with big dicks and we all laughed. I don't remember much else, except that eventually they finished up and went on their way. But by the way these guys handled it, they not only put me at ease but pretty much showed me how most guys were going to react if it happened again. And so although it has rarely happened over the years, I have never worried about another guy seeing my wood.