Look. We can shoehorn all these meanings you come up with as much as you like. But the thing is, not 2 seconds after she says this Janna gets literally sucked in by the darkness, as in, a slasher villain just got her and is about to rip her into little pieces. It's like a punchline for a horror story. The setup being what Janna said. And that's Janna's main theme that everyone seem to forget.
Janna is the spooky quirky witch type. She doesn't need no man, even the ones she entertains, she just does it for fun. She doesn't care about serious relationships because she obviously has bigger fish to fry. She's messing with Marco because it's super easy to do.