... It's a shirtless man hugging the waist of another shirtless man. The cover art doesn't even have any text on it, but instead is just a picture of a couple of shirtless dudes in an incredibly weird pose. Yeah, I'm sure lots of fathers find themselves in scenes just like this. Totes normal.
"Not every picture of two men is sexual."
Yes, no shit. Of course on HN someone would try this morally righteous horseshit, especially hilarious when it's served with a side of "Duh, of course!"
But you know what the picture represents because you were quite literally told how to interpret it. I don't want some picture I didn't ask for suddenly appearing on my lock screen (because most of us actually had empty libraries, so when this "gift" was added and the device did its fun "autoplay" nonsense, it would suddenly be active media), walking around saying to anyone who might catch site "Oh don't worry, it's an artistic image of a father protecting his son or something"
In this vastly unlikely passive aggressive hypothetical scenario, you're imagining that a random person who might see your screen would be as triggered by the image as you were. Most people had figured out by then that two men together are no more offensive or evil than a man and a woman.
I wasn't told how to interpret it, I saw an unusual picture and, where you apparently jumped the conclusion that it was two men that were obviously about to have sex and that it would be a scandalous statement on your own sexuality if anyone were to see you with that picture, I chose to look up what the explanation was. I can only imagine how much you must clutch your pearls when naval aviators play volleyball together in the movies.