The chapter states a general rule in the middle of its diplomacy and the rule is one of the book's most discussed lines. The female always overcomes the male by stillness, and by being still she takes the lower position.
The book uses the female as a positive term repeatedly. Chapter six has the spirit of the valley and the dark female whose gate is the root of heaven and earth. Chapter ten asks whether one can play the female part. Chapter twenty-eight instructs the reader to know the male but keep to the female. Chapter fifty-two and chapter twenty use the mother. Taken together they make this book unusual in the philosophical literature of its period, which mostly does not reach for such imagery at all.
Two cautions belong with that observation. The first is that the terms are used for a pattern of behaviour, stillness, receptivity and the lower position, and the chapter attaches them to states rather than to persons. Nothing here is an account of women, and the book contains no women.
The second is that the pattern is recommended as effective, not as good. The verb is overcomes, and this chapter is about one state absorbing another. The female position is presented as the winning position in a contest, which is a very different thing from a celebration of yielding for its own sake, and it is the same structure as chapter thirty-six, where the soft and weak overcome the hard and strong.
That combination, a real preference for the receptive term and a strictly practical case for it, is what makes the imagery difficult to summarise in either direction.