No caring individual would ever insert his penis into a vagina until it is lubricated. Most women prefer to use oral sex as foreplay. She often will lubricate while she is performing oral sex and he can lubricate her by depositing saliva, the most effective lubricant known to man. If taking your time doesn't lubricate the vagina, you may need to treat an infection or lack of estrogen. If oral sex turns you off, you may need to use a non-greasy lubricant such as KY jelly that you can buy at any drug store.
Greasy lubricants can damage condoms and can be aesthetically unpleasant.
Deep dyspareunia , or pain with deep thrusting of the penis, almost always occurs when the penis hits something tender in a specific spot. It can often be avoided by changing position so that the penis does not hit that spot. You can expect the ovaries to hurt when they are hit by the penis. If you have this problem, just ask your partner try another position such as rear entry or moving to one side. If he refuses to cooperate, punch him in the testicles and he will understand immediately how much it hurts to be banged on the ovary.