Where did all humans come then, pray tell?
On your corrective, I'll take the information and say "Thank you". However, it probably ultimately doesn't help your case much. I'll quote something from the article you linked:
"At the start of mammalian reproductive development, both male, sperm-carrying reproductive tracts and female, egg-delivering reproductive tracts are present. Depending on the sex of the embryo, one set of tracts usually disintegrates as development proceeds."