Basic Types of Sexual  Behavior

2. Heterosexual Intercourse: Oral Intercourse

“69”

Small Chinese porcelain figure Qing Dynasty, late 19th century. Courtesy China Sex Museum, Tongli

The slang term "sixty-nine" (or French soixante-neuf) is used to describe a form of oral intercourse in which the partners simultaneously lick each other's sex organs. In doing so, the position of their bodies in relation to each other is similar to that of the inverted numerals in the number 69.
Simultaneous mutual oral intercourse can be very enjoyable for both partners, and it can, of course, lead to orgasm. However, most men and women will probably use it only as a means of stimulation and then proceed to other forms of lovemaking because they may find it difficult to keep adjusted to each other in this unusual position. Such adjustment is a little easier if they take their time and lie on their sides rather than on top of each other. However, even then only one of the partners may be able to reach orgasm. In this case, it may be better to continue sexual intercourse in some other way.