If it's clearer to you, then yeah use it, but make sure you mention how the sexual allusions represent or are associated with the imaginative journey. When I was doing it I talked about the assonance, alliteration, biblical allusions and juxtaposition and the way in which these techniques created the imaginative place coleridge was describing. I didn't mention any of the sexual imagery because the points didn't seem to be as strong/ have enough meat. I did a speech on it for internal assessment and got full grades so I highly doubt that choosing to mention it/not mention it will affect you. Do whatever you feel comfortable with-many readings of the text are available.
