Cut the fresh passion fruit in half. Scoop out the seeds and juice from one half and set it aside for later garnish.
In a cocktail shaker, add the vanilla vodka, passion fruit liqueur, freshly squeezed passion fruit juice, lime juice, and simple syrup.
Fill the shaker with ice cubes. Secure the lid tightly and shake vigorously for about 15 seconds until well-chilled.
Strain the Martini into a chilled Martini glass using a fine strainer to remove any ice chips or fruit pulp.
Cut a small slit in the other half of the fresh passion fruit and place it on the rim of the glass as a garnish.
If you like, serve the Pornstar Martini with a shot of chilled Prosecco on the side in a separate glass. It's traditional to take a sip of Prosecco after enjoying the Martini to cleanse the palate.