Good question, Wes.........
The menstruating woman has an "open wound" when she is menstruating. She is vulnerable due to the female physiology that enhances the chances of conception, that being that the semen enters her body. The lining of the uterus is far more vulnerable at this time for any type of infection. It is shedding a layer and is vulnerable to invasion. The sperm travels through the uterus into the fallopian tubes under extreme pressure (to overcome any barriers) and is absorbed. Studies show that sexual transmission is related to viral load in the male.
Similarly, at any other time, she is also taking the sperm into her body during sexual intercourse. The male is injecting under pressure, making it even more likely to be in contact with the vulnerable tissues.
Men, on the other hand, do not have an opening, unless there is an open sore or herpes-type lesion on the penis. A man does not, as part of his physiology, absorb the vaginal fluid or take any fluid into his body. Menstrual flow would have to travel against the seminal flow in order to enter the male body. Even at that, the bloodstream is not vulnerable unless there is a break in the skin. Or, it would have to be absorbed into the healthy intact skin. If that happened, this disease would be really easy to contract by anyone! It isn't. It has to enter the body through an access point where the bloodstream is vulnerable. That isn't how men are built and it isn't the way nature set up the survival of our species.
Additionally, there are silent, undiagnosed diseases like chlymidia that actually have been shown to inhance the woman's vulnerability to infections such as HCV, HIV, syphilis, gonorhhea, and chlymidia. Then there are STD histories, or conditions like endometriosis that can have an impact on a woman's vulnerable physiology past the time of active infection or problems due to residuals of the disease.
Bottom line is, the menstrual flow WOULD be a risk IF it was taken and absorbed by the male body or through the skin. It isn't. Unless a man has an open wound on his penis, it is not even possible. How many men do you know who have an open sore on the penis want to have sex? Ouch!
I hope this helps,
thanbey
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[This message has been edited by thanbey (edited 10-19-2002).]
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