Husbands and wives both need to adjust to one another when it comes to sex. Sometimes a man may have to make some changes for his wife, but at the same time a woman might have to endure some things for her husband.
So when a woman cries all during sex could it be that the man is mistreating her? Absolutely yes. But from a Christian perspective we must realize that sometimes it could be the woman who is in the wrong for crying throughout the entire sexual experience. If a woman is crying to manipulate her husband because she simply did not want to have sex or to make him feel bad for wanting sex when she did not then the sin lies with her.
Even a woman who suffers from true painful intercourse whether it is from a temporary condition (like some of the examples Sunny gave) or if it is from a long term chronic and un-treatable condition that causes painful intercourse might be in the wrong for crying throughout the entire experience.
The point here on a woman crying during sex is this. It is not always the man that is in the wrong when this occurs. It can sometimes be the woman who is in the wrong for crying. And in some rare cases neither neither one may be wrong in what they are doing. The husband may not be in wrong for continuing and finishing and the wife may not be in the wrong for crying.