To experience jhana requires the suspension of the five hindrances and the development of the jhana factors. Sexual desire is only one hindrance. All hindrances are barriers to jhana. Furthermore, jhana is not dependent on the brahmaviharas. You can experience jhana from cultivating the brahmaviharas but its not the only way. There is not tantric-like instruction or practice that involves the recylcing of sexual energy within Theravada.
I just think you are trying to look at the Theravada through the prism of hinduism and/or Mahayana. It'll end in tears.
“No lists of things to be done. The day providential to itself. The hour. There is no later. This is later. All things of grace and beauty such that one holds them to one's heart have a common provenance in pain. Their birth in grief and ashes.”
- Cormac McCarthy, The Road
Learn this from the waters:
in mountain clefts and chasms,
loud gush the streamlets,
but great rivers flow silently.
- Sutta Nipata 3.725
(Buddhist aid in Myanmar) • •
e: [email protected]