My memory is pretty hazy since this was like 10-15 years ago but most the Adult Interactive Fiction I picked up was in the form of ADRIFT Blorb Zblorb or TADS 3 files. File structures that were also commonly used with regular Interactive Fiction games. RAGS was around but it wasnt supper prevalent in the websites or forums I looked at, but my sense at the time was RAGS was still a popular choice for games specifically themed around transformation and other more relatively niche concepts for whatever reason. With that in mind it sort of makes sense that people would still be using RAGS, the communities that were into it were really into it. Sort of sad thinking about how most those websites and groups I used to visit are gone now. Like sand through the hourglass.