Because these files are hosted on unmonitored, high-risk websites, download links are frequently laced with trojans, keyloggers, or adware disguised as game files.
In the modern era, platforms like Steam, Nexus Mods, and various mod hosting sites face the difficult task of moderation. While many platforms allow adult content under strict age-gating, content depicting sexual violence or extreme illegal acts is almost universally banned.
: See what other players have to say about the mod. Community feedback can give you a good idea of what to expect and whether the mod is worth trying.