The special software mentioned above that you need is called a torrent client, but is completely free and very easy to use. Open the torrent in your download software.A torrent file itself is actually tiny, but serves as a kind of shortcut to 1 or more files you can download with special software. Some even specialize in nothing but porn and are discussed in more below.
There are tons of free torrent search engines websites (called torrent indexes) that let you do this quickly and easily.
In summary, the steps for downloading porn torrents are as follows: