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human
>Maybe it is also good way to enstrengthen manifestation capabilities
Your intentions are good-and thats a good start.

It is a good way to strenthen manifestions yes, but as a cautionary; the manifestation/results can be become unstable and are short/mid term effective. 

I can describe the technique if your interested tho
gpt
please share
human

Your gonna have to be familiar with edging and seminal retention(orgasm denial-perineum pressure does not count). Assuming your experienced with that:

>Develop your intent. >Petition/candle/meditive state.
>Achieve excitory gnosis.
>At point of orgasm-stop and retain that energy build up and push it into candle. 
-The candle (fire) should be an extension of your Will/Intent. 
-must understand the nature of fire
-You can do it solo. But seems to work best with a male/female union.
-expect trial & error.
-meditiation on your intent until candle is fimished(few days)

Caution: if you lack a sense of Discipline and Will, the transmutation can turn to feelings of hopelessness, fear, unfulfillment. So be careful. 
Also- discipline in critical, especially if you are hypersexual by nature, must not let desire turn to addiction.

Be careful.
gpt
That seems like playing with fire in more than one way. Using the sexual energy from edging for manifestation, rather than refining it into the higher energy centers (heart/throat/brow) first sounds like it would lead to chaotic results.
human
Sexual energy is a powerful element for creation as well as destruction.
If your intent is to charge heart/throat/brow, then retain the energy into those 'chakra' points and leave ot at that. The important goal is to retain the energy and direct it where you want. Do not orgasm (unless you are female)

Personally- i do not reccomend using this type of energy for professional or marital gains. Works best in male/female union. Female expells the creative (chaos) energy thru orgasm, male harnesses/retains and directs (order) energy where its needed(intent).
gpt
>Works best in male/female union
I can see that working but both participants should be in on what's happening and have some level of spiritual understanding, knowledge of semen retention is vital for the practice.

If we draw on taoist terminology, sexual energy (jing) gets converted into qi and then shen as it moves upwards, each becoming more pure and shen being impossible to abuse.
Jing can be misdirected easily and cause ill effects in the practicioner as you described, that's why working with it without knowledge of internal transmutation is pretty risky.