Database gets updated before SaveChanges is called in Entity Framework - entity-framework

Question

I am trying to use EF with an insert stored procedure as I have no direct access to the table. My understanding is the database should not get updated until SaveChanges() is called in the code but database is updated everything an insert happens. In this case, 4 database calls were made.
How do I make this to have just one database call and update multiple records?
This may be classed as database-first EF? The stored procedure is imported as a function to edmx in a normal way.
Code sample:
public ActionResult Index()
{
List<Product> products = new List<Product> {
new Product() { Title = "coca cola", Description = "good"},
new Product() { Title = "apple", Description = "fruit"},
new Product() { Title = "orange", Description = "fruit"},
new Product() { Title = "banana", Description = "my favourite"}
};
EFwithSPtest context = new EFwithSPtest();
foreach(var p in products)
{
context.Insert(p.Title, p.Description);
}
context.SaveChanges();
return View();
}
Stored procedure:
ALTER PROCEDURE [dbo].[Insert]
#Title nvarchar (50),
#Description nvarchar (max)
AS
INSERT INTO [Product] (Title, Description) VALUES (#Title, #Description)
RETURN 0
Auto generated DbContext class:
public partial class EFwithSPtest : DbContext
{
public EFwithSPtest()
: base("name=Entities")
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}
public virtual int Insert(string title, string description)
{
var titleParameter = title != null ?
new ObjectParameter("Title", title) :
new ObjectParameter("Title", typeof(string));
var descriptionParameter = description != null ?
new ObjectParameter("Description", description) :
new ObjectParameter("Description", typeof(string));
return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction("Insert", titleParameter, descriptionParameter);
}
}