You need to download stable diffusion and install it on your computer locally (it needs a fast processor and works quite slowly at about 1 picture each 15 minutes). Then you need the appropriate model from civitai, called either airfucksWildMix or musesErato and download this (there are other models available on the site, google it). They make pictures that frequently have body horror in them, i.e. wrong connections between limbs, weird cocks, only partial bodies. Don't be scared, tell the AI to make 100 pictures and run it over night, ignore the strange stuff and go for the nice pictures (maybe 10-20 % in a 100). The process of scrolling to find nice pictures actually turns me on.
Since this runs locally, there are no restrictions on NSFW and nobody needs to know what you are doing.
It is 100% free (but you need a fast computer).
I use gimp (similar to photoshop, but free) to improve some pictures that I like, but have something wrong (like too many fingers on a hand). Also you can go wild and combine parts from other pictures (penises are not so easy for the AI, so find a nice one in another picture and paste it in).
Let me figure out how to post some example images...