What about energy orgasms?
Even with energy orgasms (without loss of semen for the men), there is still loss of energy and some time to recharge your stamina.
This means that when you engage into tantric sex, it is still better not to go all the way to even an energy orgasm.
You keep on building energy without releasing it.
You will feel the sexual energy building up and opening gates in your being.
You will feel activation of the chakras especially heart and third eye.
Now, if you release energy when building up, you will actually lose precious life force in the process.
Even with an energy orgasm, it can take a few days to rebuild sexual tension.
On the other hand, if you don't release your energy but let it build up, you will put it to much better use.
After a couple of weeks to a month of tantric sex practice, you eventually reach a point where the effects of your practice become extremely present.
Your awareness starts expanding. This is due to the activation of the third eye.
At the same time, you might get this stable feeling of intense joy.
That's the clarification of the solar plexus and the opening of the heart chakra.
Once you reach this energy plateau and break through, having an energy orgasm is somehow much less of a loss of energy.
You maintain that state of sexual tension more easily.
This is as long as you don't orgasm a few times in a row in which case you will loose most of your stamina and get back to your starting point.
The good news is that even if you orgasm and lose energy in the process, you will be able to rebuild energy easily.
Simply give yourself time and be patient as your sexual tension builds up again.
To your tantric power!