How to disable collision2D damage when I am not attacking?

I'm using the following scripts to attack my opponent and take health. If I come into contact with the other player, The player loses health; whether I'm attacking or not. How do I stop the player from taking health when he is not attacking?

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class GameControlScript : MonoBehaviour 
 {
     public int mePlayerHealth=100;
     public int meKickDamage=5;
     public int meFistStrikeDamage=4;
     public int meSnakeStrikeDamage=3;
 
     public int me2PlayerHealth=100;
     public int me2KickDamage=5;
     public int me2FistStrikeDamage=4;
     public int me2SnakeStrikeDamage=3;
 
     public Scrollbar LeftHealthBar;
     public Scrollbar RightHealthBar;
 
 
     //is the game still going?
     public static bool isDead = false;
 
             
     // Use this for initialization
     void Start () 
     {
         print (mePlayerHealth);
         print (me2PlayerHealth);
     }
 
 
 
 
     public void meTakeDamage (Collision2D coll)
     {
         if (coll.gameObject.tag == "me2Kick") {
             mePlayerHealth -= meKickDamage;
             print ("You kicked me  " + mePlayerHealth);
             LeftHealthBar.size -= .05f;
         } else if (coll.gameObject.tag == "me2Snake") {
             mePlayerHealth -= meSnakeStrikeDamage;
             print ("Your snake hurts me  " + mePlayerHealth);
             LeftHealthBar.size -= .03f;
         } else if (coll.gameObject.tag == "me2Fist") {
             mePlayerHealth -= meFistStrikeDamage;
             print ("Your fist is hard  " + mePlayerHealth);
             LeftHealthBar.size -= .04f;
         }
     }
 
 
 
 
 
     public void me2TakeDamage (Collision2D coll)
     {
         if(coll.gameObject.tag == "meKick") 
         {
             me2PlayerHealth -= me2KickDamage;
             print ("You kicked me2  " + me2PlayerHealth);
             RightHealthBar.size -= .05f;
         }
 
                 else if(coll.gameObject.tag == "meSnake") 
                 {
                     me2PlayerHealth -= me2SnakeStrikeDamage;
                     print ("Your snake hurts me2  " + me2PlayerHealth);
                     RightHealthBar.size -= .03f;
                 }
                         
                     else if(coll.gameObject.tag == "meFist") 
                     {
                         me2PlayerHealth -= me2FistStrikeDamage;
                         print ("Your fist is hard 2  " + me2PlayerHealth);
                         RightHealthBar.size -= .04f;
                     }
     }        
 
 
 
 
 
     void Update()
     {
         if (me2PlayerHealth <= 0) 
         {
             isDead = true;
             Debug.Log ("You have defeated Me2");
                                     
         } 
                                     
 
             if (mePlayerHealth <= 0) 
             { 
                 isDead = true;
                 Debug.Log ("You have defeated Me");
                                         
             }
                                     
     }
     
 
 }