It's usually checked for NPCs, not the PC, because other characters aren't written to be REDONK and, even then, it's catering to a specific fetish instead of being more of a sanity check.
That said, much like most characteristics looseness doesn't have a lot of alt-texts for varying degrees. Urta in CoC would sass you depending on how loose you were the first time, as an example; it was a one liner thing and pretty much what you expect from other instances elsewhere. It's quite likely you wouldn't even notice it!
Looseness also shows up in your pussy/ass descriptor, so it can get peppered in the text when with parser calls. Ie, your waifu jams it into your loose slutty cunt etcetc.