Havelock Ellis,
Studies in the Psychology of Sex…
“ Thus, cunnilingus and fellatio derive part of their attraction, more especially in some individuals, from a predilection for the odors of the sexual parts. (See, e.g., Moll, Untersuchungen über die Libido Sexualis, bd. 1, p. 134.) In many cases smell plays no part in the attraction; "I enjoy cunnilingus, if I like the girl very much," a correspondent writes, "in spite of the smell." We may associate this impulse with the prevalence of these practices among sexual inverts, in whom olfactory attractions are often specially marked. ”
