I am practicing celibacy from last 6 months. I cannot control my nocturnal emissions.
Buddhism does not teach to control nocturnal emissions, apart from having the mind free from thoughts of lust all day, including before sleep.
I have some control but not complete control.
I doubt you have any control. Teenagers who don't masturbate don't necessarily have very frequent wet dreams. When I was a teenager, I started having wet dreams at 14 years old and did not masturbate until 16 years old and only because a friend kept talking about it. In fact, I even had a few sexual encounters with girls before I ever masturbated. I do not recall ever having very frequent wet dreams as a teenager. Similarly, when I became completely celibate at 23 years old, I don't recall having frequent wet dreams. At most, once a month but generally every six weeks.
In the beginning I used to get wet dreams every 10-12 days
Sounds unusual but if that occurred it occurred.
now I get them every 45-50 days.
Yes. The above is the duration expected, every 30 to 60 days but generally around every six weeks.
I have extremely pure thoughts all day long. I don't think that I'll ever get sexual thought again.
The above irrelevant. There appears no consensus in Buddhism and only one assertion that an Arahant (fully purified mind) cannot emit semen. Refer to book page 97.
I believe that I have trained my mind very well. One the nights when the emission happens I don't have any erotic dreams, it happens without any sexual thought or an erotic dream.
Yes. When the mind is very pure, nocturnal emissions never or rarely occur with sexual dreams.
I practise Halassana & Balasana every day without fail.
This is a Buddhist forum. The above (very dangerous) Hinduism is irrelevant.
I also do physical activity running mainly.
Irrelevant to Buddhism. In Buddhism, the mind is made pure by wisdom & calmness. Buddhism teaches deep meditation calmness (called 'samatha') eliminates lust.
Why am I still not able to control wet dreams? I want to get rid of them completely.
Again, irrelevant to Buddhism.
Do all monks get nocturnal emissions?
There appears no consensus and only one assertion that an Arahant cannot emit semen. Refer to book page 97 and search other uses of the word "emit" & "emission".
How often does it happen to them especially young monks age around 24-25?
This question is irrelevant because each monk is different. I personally gave up having sex with women when I was 22 years old and found Buddhism in a monastery when i was 23.5 years old, where I had immediate calmness from meditation and also stopped any masturbation. I do not recall any high frequency of nocturnal emissions. Generally 30 to 60 days, average 45 days. Sometimes two days in a row or twice in three days during the average 45 day cycle.
If it happens to them, what do they do about it?
Nothing, except wash their sleeping cloth & take a bath.
If it doesn't then, how does they train themselves to reach that level?
They don't, apart from freeing the mind from lust, such as in Bharadvaja Sutta.
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The questions are not really Buddhist and are the type of obsessiveness Buddhism avoids. The impression is your mind is building ego or self around this matter. Buddhism teaches life has no real self and is only composed of elements of earth, wind, fire, water, space & consciousness. Nocturnal emissions are merely natural phenomena or natural elements. Buddhism teaches to regard nocturnal emissions as: "This is not me, this is not mine, this is not myself", as follows:
And what is the water element? The water element may be interior or exterior. And what is the interior water element? Anything that’s
water, watery, and organic that’s internal, pertaining to an
individual. This includes: bile, phlegm, pus, blood, sweat, fat,
tears, grease, saliva, snot, synovial fluid, urine, or anything else
that’s water, watery, and organic that’s internal, pertaining to an
individual. This is called the interior water element. The interior
water element and the exterior water element are just the water
element. This should be truly seen with right understanding like this:
‘This is not mine, I am not this, this is not my self.’ When you truly
see with right understanding, you reject [nibbindati; become disenchanted with] the water element, detaching
the mind from the water element.