ELI5: Sex

Sex in English can mean whether you're a boy or a girl, or how babies are made.

Think of it like this:

• Imagine you're building a LEGO castle. Some LEGO bricks are blue, and some are pink. Sex is like knowing if a LEGO brick is blue (usually meaning a boy) or pink (usually meaning a girl). It's a basic way to tell them apart. This is called biological sex.

• Now, imagine two LEGO castles need to combine to make a super castle. Sex can also mean the special way that a boy LEGO and a girl LEGO can sometimes fit together to start building a brand-new, baby LEGO castle. This involves special LEGO parts that only boys and girls have.

• It's also important to know that sometimes, LEGO bricks might not fit neatly into just "blue" or "pink." Some might be a mix, or feel more like a different color inside. This is a bit like how people sometimes feel different about their sex than what doctors said when they were born.

• Whether you're a boy or a girl (like blue or pink LEGOs).
• How a boy and a girl can sometimes make a baby (like combining LEGO castles).
• It's important to remember that everyone is different, and sex isn't always simple.