"Whosoever wants to learn how to transmute the sexual energy must know in depth the Vajroli Mudra, since if they do not know it, they do not know, because they do not have the science for sexual transmutation." - Samael Aun Weor
So it seems to fully transmute the sexual energy as a single person Pranayama is not enough and the Vajroli Mudra is essential.
Is it possibly acceptable to stimulate the phallus/testicles/prostate immediately before inhaling in the shape of a jar in order to achieve an adequate erection if we are unable to achieve an adequate one when only massaging after the exhale (purity retained of course)?
I have been doing Christic Egyptian Pranayama, Seven Runic Vowels, and the Vajroli Mudra in that order back to back. Could this be why I am unable to achieve an adequate erectiion when I get to the Vajroli Mudra?
Would eating some fire be possibly appropriate?