Is your vagina fully aroused before you start having intercourse?
Women (and men) assume that because she’s had an orgasm that her orgasmic platform is properly aroused. It’s usually not the case. It takes the average woman between 10 to 15 minutes for her orgasmic platform to fully engorge with blood (a man's penis takes approximately 30 seconds to one minute). The average couple sex lasts for 10 to 12 minutes, meaning sex is usually over just as she's getting properly aroused.
When in a resting state, the vaginal canal is a collapsed three inch tube. As it becomes aroused, it balloons to approximately six inches and begins to sweat (her lubrication).
The end result of a woman not being properly aroused is she’s probably having intercourse with a semi-ballooned vaginal canal. And it’s probably not as pleasant as she (or he) would like it to be.
This is why every sex expert under the sun preaches, foreplay, foreplay, foreplay.