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I assume that when sperm enters a female it is a foreign substance, why does the bodys defences not then seek it out and attack it? I would guess there are special cells or something that guard the sperm, but what and why?
there are actually women who are allergic to semen...
Good points made. However, I wonder how sperm have evolved to travel ad mostly survive in an environment which they have never entered before? I am sure that the vagina must have mucus and various immune cells and antibodies present on the epithelial surface. Maybe the sheer number of sperm present 'overwhelm' the vaginal immune system buying time for more motile sperm to escape into the surface. Just my opinion...
Maybe a Test tube or proxy carrier!
The immune response is only if there is direct contact between the mothers blood and that of the foetus. The blood supplies are close, but not actually mixed.
Bianchi found male cells in 17 of the patients, but when she compared her results with those of the amniocenteses, she noticed that only 13 of the women were actually pregnant with boys. The other four women carrying cells with a Y chromosome had all been pregnant before: two of them had given birth to sons and the other two had had terminations. Bianchi then went on to analyse blood samples from eight non-pregnant mothers with sons. To her surprise, male DNA was present in six of the women, including one who had her last child, a boy, 27 years before the test.Although the presence of foetal cells in the maternal circulation during pregnancy is a phenomenon documented as far back as 1969, the persistence of these foetal cells years, even decades, after pregnancy was a relatively novel concept. Soon after the publication of Bianchi's findings, Dr Lee Nelson from the Fred Hutchinson Cancer Research Center in Seattle published a report on the association between enduring foetal cells and the incidence of certain auto-immune diseases in the mother. It had long been known that women are more susceptible to this type of disease than men, and these new findings offered a possible explanation for this phenomenon.