If you look behind it it says ", questNote: " and I think the rest of the text is obscured due to poor design choices of the boxes so I think you can only activate that option once during a specific quest, I tried the scene with a full save and it still doesn't work so that's my assumption. There's actually a few more scenes where you can't choose something solely because of a quest marker and no stat requirements.
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Here's an example of it with the text not obscured it honestly looks like a bug cause its worded so badly with "_" and no spaces etc this is from Lana 3SME or whatever the scene is called.
Honestly the gallery is just really shitty when it comes to how its programmed and implemented since the gallery just initiates the scenes as is so you have to raise your slutiness which is a temporary stat just for you to see certain events so in essence complain to the devs