After a while the pressure where they are crossed will cause you to move.
One of the significant things to remember when you set out to listen to a Paraliminal. The desire to cross your limbs at the beginning of the listening session is often a sign that you are somewhat closed or doubtful of the outcome. (body language) So uncrossing at the beginning might feel uncomfortable because you feel yourself too open. Consciously trying to maintain an open posture is an saying I'm going to give this a chance. And yes it will feel uncomfortable at first. If you're sitting use an armrest. If the arms feel too far apart prop them with a pillow or cushion.
An open posture will allow much faster changes with the Paraliminals.
Alex