Vaginal fornix

The fornices of the vagina are the superior portions of the vagina, extending into the recesses created by the vaginal portion of cervix. There is an anterior fornix and a posterior fornix. The word is Latin for 'arch'.

Sexuality

During sexual intercourse in the missionary position, the tip of the penis may reach the anterior fornix, while in the rear-entry position it may reach the posterior fornix.
The anterior fornix is also called the a-spot, an analogue to the g-spot, which is closer to the vaginal opening, and also on the anterior side of the vagina.