How do you tell someone to hide their erection because there are kids around?

As I mentioned in a previous post, I work night audit at a hotel a few days a week for extra dough. This position has opened my eyes to a part of society I was largely blind to... I checked a family in last night while a guy in shorts, t-shirt and no underwear sporting a noticeable erection was behind them waiting for me to make him another keycard because he locked himself out. Why does someone trek outside their hotel room with a massive erection? There are no condom machines. Drinks and snacks, yes, but thirst and hunger come after your arousal. Even if he does not have underwear or is too lazy to put some on, he can at least do some of the easy erection hacks that every red blooded American man knows: such as the waistband tuck. Or he could put his hand in his pocket and gently press his blue vein throbber against his leg or thigh to hold it out of sight. He also could have just finished himself before entering public space, or just covered his swollen meat whistle with the Bible in his room or waited in the pitch dark breakfast lobby until the family left. I'd gladly post this on one or both of the hotel stories subreddits, but they forbid the word penis and all it's slangs.