Healthy Sine
re-orientation towards
a healthy normal sexual cycle
When I mention "subdue", I'm not talking about repression.
I'm talking about
harmonious cooling and going deep: restoration, the yin part of the yin~yang cycle.

I think that we can agree that there is a sexual cycle, and that we want to honor all parts of it for a healthy sex life.
(I'm
not talking about some narrow-minded absolute of making one point in the arc last for ever.)

It's natural:

Even birds' wings cycle through yin~yang.
And I'm not talking about some super advanced esoteric rocket standard, here.
Just
normal, healthy, yet still progressing in the human and spiritual.
Certainly part of this is enjoying a lush active sex life in its' time. That's why we
often see men in the cultivation community who've spent a lot of time alone in
meditation, etc, at some point
recognize that they need to get laid more and decide to put more attention towards the courtship arts
('game').
Basic healthy balance.
As men, we tend to be more yang. We tend to be more sexually frenetic, and are notorious for
dysfunctionality along that line.

For those that go into sexual addiction, it takes over their lives. In the
long run, this
moves towards a condition of all heat and no substance. The incessant excessive yang
(stimulation of lower energy and nerve plexus) depletes yin (substance) and leads to exhaustion of yin and collapse of yang.

Semen retention easily fosters a pattern of sexual addiction, as the dangers of retention are stagnation (stuck energy) and heat.
Trapped heat just keeps things stirred up, keeps
sexual desire chronically active. All the worse if an aspirant is disoriented enough to mistake any kind of desirous activity for 'the main path'.
For those few who are actually advanced enough to make good use of it, retention can be a powerfully positive addition to their spiritual
path, kudos!
BUT, retention is something that - if you do it wrong - you get the opposite
result: damaged vitality. So, in the spectrum of healing ~ healthy ~
advanced jing gong, here I am emphasizing the virtues of basic healing and
normal healthy.
If you observe your own sexual cycle, you'll notice that there are parts:

I think that, for most men .. that is, what is challenging, yet accessible and healthy to work on for most is:
1. How "not-to-start when it's-not-the-right-time". That is, how to harmoniously subdue the
energy so that you're cool & restored by it (the refinement of unaroused/cool
jing), and so that you can get on with other things.
2. How to "cool off afterwards". Resolving residual heat and tension
so that sexual activity doesn't go on for too long, excessively, to allow the yin part of the cycle.

Again to emphasize, I'm talking about 1&2 as appropriate to a natural yin
time, not as repression of yang. Plenty of benefits, imo, from those.
Healthy. Might not market well. Clearly should be pre-requisite to
the more advanced and more dangerous semen retention
attempts (if you choose to experiment with such). And I'm not
suggesting that a person always has to be strict about when to
cool down and so
on, only that you should have the ability to apply as you see fit.
That's my two cents. ;)
Trunk
"Sexual desire, therefore, is a manifestation of the fire of both the Kidneys and the Liver."
- from the commentary on the acupoint Liv-4 in A Manual of Acupuncture