Okay kiddo, so in our bodies we have a special hormone called gonadotropin that helps us with our fertility - that means helping us make babies when we're grown ups. But sometimes our bodies need to make sure we don't have too many babies at once or too early, so it has a special "off switch" called the gonadotropin surge-attenuating factor, or GSAF for short.
Think of it like a light switch. When we need the lights on, we flip the switch up and they turn on. But if we flip the switch down, the lights turn off. GSAF is like flipping the switch down for our gonadotropin hormone.
GSAF comes from a special part of our brains called the hypothalamus, and it tells our pituitary gland (another important part of our brain) to stop making too much gonadotropin. This helps us regulate our fertility in a healthy way.
So basically, when our bodies need to slow down on making babies, GSAF comes to the rescue and helps us regulate our fertility levels. Pretty cool, huh?