nedarim 73

the man who cannot hear his wife's words to cancel them.

and the women who empower each other not to say anything.

Since a husband has to hear his wife's vows to cancel them, a deaf man cannot do this. Also discussed is a husband cannot cancel two wives' vows at the same time. This is compared to not having two women go through the sotah process at the same time. Because the women will show solidarity to each other and empowered by each other's presence they won't confess to their sexual indiscretions.