According to [TVTropes](http://tvtropes.org/pmwiki/pmwiki.php/Main/DeusSexMachina) (usual warning, don't follow the link or you'll waste half your life in a twisty maze of content):

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>  In Ghostbusters, it's strongly implied that Dana Barret, while possessed by Zuul the Gatekeeper, had sex with Louis Tully, who was possessed by Vinz Clortho the Keymaster (key, gate, get it?), in order to free Big Bad Gozer. In fact, a deleted scene from the movie has Venkman explicitly asking Dana if she and Louis "did it".
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I turned the quote into a spoiler since it contains really poor-taste joke, but the gist of it is that it's implied that *as part of freeing Gozer*, the two characters possessed by the Keymaster and the Gatekeeper had sex.

Is there any **canon** confirmation or denial of this theory (canon meaning something from creators' interviews, DVD commentary, script, delete scenes etc...)?