Rey's worried that wanting to dominate her boys must be a bad dark side thing and doesn't understand how Poe (a natural born leader) or Finn (who wants to break all habits associated with the first order) are so happy and quick to submit to her in bed.
Rey's convinced she must be an awful person and must be using Jedi mind tricks to force them to obey her.
Both Finn and Poe find out about this and explain to her that it's not a bad thing, and that neither of them are being forced. They just really love submitting to her.