What is Victoria's Secret actual secret?

That their lingerie, in addition to being overly expensive, is very low quality. More than half of what you pay, ends up going to all the money they spend on advertising and models.

probably that despite whatever I spent, I ain't getting any, nor even to see the gear used in anger.

You're paying too much to give a false sense of sexiness

Their models sleep around!

Can't tell. It's a secret.