Women who have been educated at a tertiary level are far more likely to give and receive oral sex.
At least according to Hilda Hutcherson MD who wrote the book What your Mother never told you about Sex. (find a copy here)
Why might this be? There are many theories, but the most popular one with women argues that an educated woman is more likely to be experimental. Many women feel that understanding their own sexual nature is their responsibility and this belief increases with education. Therefore, It might be the most educated women who are the keenest to try many things and initiate this kind of pleasure.
Food for thought.
(We are not affilliated with Dr Hutchersons book or Amazon)