Because it is based on LoRA but is trained with Conv2D

Main tag : after anal,
Pose tag : sitting, standing, leaning forward, from behind,
Secondary tag : cum, gaping, spread anus,
LoRA str : 1

Conv2D requires need extensions
https://github.com/KohakuBlueleaf/a1111-sd-webui-lycoris
or
https://github.com/kohya-ss/sd-webui-additional-networks