Refers to a part of the vagina that is deep inside of it, next to the cervix or underneath is. The various spots (A-Spot, G-Spot and O-Spot) are favorite subjects of articles in women’s magazines. However, not all women enjoy stimulation in these areas. The best approach is explore with a woman giving her partner lots of feedback. During vaginal intercourse, the head of the penis will often stimulate the anterior fornix of the vagina. During rear entry intercousre, the head of the penis will often stimulate the posterior fornix of the vagina.