Duh....that's the point, he had no mother or physical father to pass their sin nature on to him, but he did just fine with out their help.
Why would we be different then him, we don't need help from our parents, and just as Adam, we'd do it anyway.
Adam received none (except from Eve I guess). He came up with it all by himself.
Eve had nothing to do with Adams nature, his physical body and human nature is all he needed.
It's what causes all men to sin, not some contaminate passed on through the blood.
It's human nature, and both men and women are born with it, except Mary of course. :-)
SD