Occasionally, you will eventually be forced to Fight. A weapon will increase your Attack in Combat (and only in Combat). Keep in mind that your Attack in Combat is limited to 100, so, if your Attack is 100, having No Weapon is the same as having a Mallet.
Outside of combat, your weapon have minor effects on other aspects of the game. For example, a whip will be used when you spank your slave.
You can purchase and change weapons from the Shop.
 No Weapon
You start out with no weapon. Having no weapon means you will do considerably less damage than if you had any weapon, so be sure to buy one before entering combat.
When you have no weapon, you have two commands: Punch and Kick. Punch does a small amount of damage. Kick does more damage, but is less likely to hit.
This is the least powerful weapon (bonus of about 20), but it still does considerable more damage than having no weapon. It is only available to female and hermaphrodite slavers.
It gives two commands: Whip and Stun. Whip does a small amount of damage. Stun will attempt to make the enemy skip its turn.
 Bow and Arrow
This weapon is the third most powerful weapon (bonus of about 25) and can be used by anyone.
It gives you two commands: Shoot and Rapid Fire. Shoot does a medium amount of damage. Rapid Fire does lots of damage, but has a higher chance of missing.
This is the second most powerful weapon (bonus of about 30) and it can only be bought by a male slaver.
It gives you two commands: Slash and Lunge. Slash does a medium amount of damage. Lunge does more damage with a lower chance of hitting.
This is the most powerful weapon (bonus of about 40). It can only be acquired by having Akane as a slave. When you try to buy a weapon, she will give it to you for free.
It only gives one command: Hit.