Simplify the following text for a Grade 5 native English-speaking person.
Original: The glans is also commonly referred to as the `` head of the penis '' , while common British slang terms include `` helmet , '' `` knob end '' and `` bell end '' , all referring to its distinctive shape .
Simplified: It is also called the `` head '' of the penis . Slang names include `` helmet '' and `` bell end '' .