Parallel to this development, the term "slash" was also being used in some fandoms to denote fan fiction or other fanworks depicting sexual acts with an implied rating of NC-17, whether homosexual or heterosexual. It is likely that this is the same "slash" term born of the "Star Trek" fandom but adapted to the pornographic focus that commonly dominates fanfiction and fans works in the Kirk/Spock ship, as well as the various ships of other same-sex couples. This caused the term to spread to heterosexual ships.