fuckerism — prejudice against people on the basis of who they fuck (or would like to fuck).
In general, morphology doesn’t dictate meaning; the fact that “homophobia” and “arachnophobia” are similarly constructed words doesn’t mean they have to have analogous meanings.
Pornography is not played on a pornograph turntable.
Racism is not the same sort of thing as communism, cubism, masochism, autism, or Buddhism. The fact that those words all end in “-ism” doesn’t mean they are close analogies to one another. The words “sexism”, “ageism” and “ableism”, though, were coined as deliberate analogies to “racism”.