Problem with While Statement

[nish97]

I'm new to C++ and only been learning it for 3 days and so don't know all the syntax but I have a problem with this while statement. If anyone could help me it would be much appreciated!

  std::cout<<"Enter the name of the person you want to write to\n";
	string name;
	char friend_sex;
	friend_sex=0;
	cin>>name;
	string friend_name;
	cout<<"Enter friend's name\n";
	cin>>friend_name;
	while (friend_sex!='m'||friend_sex!='f'){
		cout<<"Enter friend's sex (m or f)\n";
		cin>>friend_sex;		
	}
	cout<<"Dear "<<friend_name<<"\n";
	cout<<"		How are you?\n";
	if (friend_sex=='m');
		cout<<"If you see "<<friend_name<<" please ask him to call me\n";
	if (friend_sex=='f');
		cout<<"If you see "<<friend_name<<" please ask her to call me\n";

I want it so that it keeps looping the "Enter friend's sex" until an 'm' or an 'f' is entered...

[AbstractionAnon]

Line 9: You want an and condition (&&), not an or condition.
If friend_sex is 'f', then friend_sex!='m' is true.