It started as Kirk/Spock, but you'll find plenty of examples of Slash being used to describe non-canonical sexual relationships. Consider http://en.wikipedia.org/wiki/Shipping_(fandom)
A/B is different from "slash." If you use the word slash, it implies homosexual stuff. That's why a lot of authors write "no slash." They don't mean no non-canonical pairings: they mean they're homophobes.
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