heteroerotica

The story

1. Proto-Indo-European*sem-
2. Proto-Indo-European*sḿ̥teros
3. Proto-Hellenic*hə́teros
4. Ancient Greekἕτερος (héteros)
5. Englishhetero-
6. Proto-Indo-European*h₁rem-
7. Proto-Indo-European*h₁rém-e-tider.?
8. Ancient Greekἐράω (eráō)
9. Ancient Greekἔρως (érōs)
10. Ancient Greekἐρωτῐκός (erōtĭkós)
11. Latinerōtica
12. Englisherotica
13. English todayheteroerotica

From hetero- + erotica.