Among animals the influence of the olfactory perceptions on the sexual sense is unmistakable.
"Anomalies and Curiosities of Medicine" by George M. Gould
Olfactory sensations awake vague and half-understood perceptions, which are accompanied by very strong emotion.
"Studies in the Psychology of Sex, Volume 4 (of 6)" by Havelock Ellis
They become transformed at once into visual, instead of into olfactory or gustatory percepts.
"Illusions" by James Sully