Vaginal dryness during sexual intercourse can have several reasons. One of the main ones is that the lady is not yet completely ready to proceed with penetration. This is often a neglected or ignored part of the activity, and if you are faced with the problem, you need to make certain you pay special attention to it. Scientifically speaking, once the female is suitably stimulated sexually and her body is ready for intercourse, the vagina releases fluids which have the function of easing the entry of any object. But this will only happen if the female is ready. Perhaps you would need to spend time making sure this happens. Stimulation can be of various kinds, whether oral or physical, but it must all be aimed at preparing both partners for the actual act of sex.
It is also possible that some women have the problem of an excessively dry vagina in the best of circumstances. This could sometimes happen due to some kind of medication they are taking. It could also happen if sex has not been a pleasant experience for the woman in the past. Any such thing will tend to make a woman literally "freeze up" before the act. It would do you well to address this issue, which cannot be ignored by any standards. In order to figure out if vaginal dryness is a side effect of any medicine, a medical examination is required. If it is, then the doctor can be requested for an alternative, which is usually possible. There is also a variety of vaginal creams, gels and lubricants easily available over the counter, and you could want to try one of these to see if they work for you. If you do not wish to use these, you can also use simple Vaseline or cold cream to help matters along.
answered by M W