Just because you have sex with this or that person in the industry, sometimes you can only go so far i.e. they will get your foot in the door but you still need the talent, etc to stay there and continue up the ladder. Like, from time to time we will see in Hollywood an actor or actress seemingly come out of nowhere yet get pushed super hard for unclear reasons. Often this happens with nepo babies like Jaden Smith or Amber Heard, who, more or less, was confirmed to have slept her way up the ladder then, of course, utilized her relationship with Depp to continue to rise until it all fell apart. And, obviously, all of the climbers in the industry who had connections with Weinstein and once he fell out of favor, their careers largely fizzled due to it.
Effectively, this is like sleeping with a roadie to get backstage to meet the band but if they don't like you, you'll be leaving real fast.