Men are physical strength specialists compared to women. It's one of the most prominent sexual dimorphisms in our species.

So it's kind of important to clarify what one means by "strength" when talking about sex (or about gender, given that there is a high degree of congruence between sex and gender expression).

If one means metaphorical strength, then both sexes can have (or fail to have) a great deal, without the kind of clear shift in mean capacity that you see with physical strength.