Tisha Be'av is a day to remember the shiploads of young men and women that were shipped off to Rome after the Churban to be used in "human trafficking", but instead of allowing their bodies to be defiled, they gathered together and jumped into the sea, drowning Al Kiddush Hashem. Let us remember their sacrifice to stay pure, to completely give up their bodies to Hashem rather than let themselves be defiled. When we feel like lust is attempting to drown us, we should remember these martyrs who preferred to drown in water rather than become slaves to lust.