Женщины is plural, but it is also singular genitive. You can see the difference when there is У in front of it. The word after should be in genitive. I assume the plural genitive is different. Someone up there suggested it is женщини. Best is probably if you look up a table with the different cases so you can remember them. Luckily I had latin in school. It works similarly.
It's the genitive singular, which in this case (and various others) is spelled the same way as the nominative plural.
Possessing multiple objects wouldn't make the subject plural, though. :)