i think you can Penis Enlargement every day, but sometimes your glans gets sensitive or chafed and so you need to rest for THAT to heal. also, as far as toughening of tissues, that might be needed in order to increase intensity.
the question is- does increased tensile strength equal increased elasticity? what i mean is, when your peni heals 'tougher', does that mean you can now stretch it harder and farther?