[Avodah] Why the woman is makneh herself

[Shmuel Weidberg]

I think the reason that the Torah required that a woman give up her
right to exit a marriage of her own free will is because nashim daatan
kalos. Women would be too quick to enter a marriage if it was too easy
to exit. Likewise, they would exit the marriage more easily in the
face of a temporary setback.

The gemara gives this reason for the takana that the husband has to
write a kesuba.

-Shmuel