Nowhere in its usage in its native language or in English is a slur. When discussing a word, I will use the word as that as the subject for discussion and unlike you I prioritize people over loan words.
Here’s a good explanation taken from your original receipts blog:
”It’s [futanari/futa] considered a slur because it’s almost exclusively used in pornography to objectify [and degrade] people.
- It’s a slur against intersex people because ‘futanari’ means ‘hermaphrodite’
in Japanese. ‘Hermaphrodite’ is a slur against intersex people.
- It’s a slur against trans women and trans-feminine people because people
often use it to describe trans women/trans-feminine people in a demeaning way.”