orgasm while retaining your seed is possible. this is *NOT* about intrograde ejaculation (cum into your bladder and thus LOSE your semen is not different from cumming normal and losing your semen). needs high skill but is possible.
TLDR: flex Musculus pubococcygeus like crazy and keep it flexed until you are done this will stop semen leaving your balls. train this before you do it by holding back your pee and then doing it while not peeing aswell otherwise you might ruin your streak and lose vital fluid! you have been warned. most WILL FAIL doing this but i want to share this knowledge. not cumming since 1st of september. only difference i see is i need a little bit less sleep

https://en.wikipedia.org/wiki/Levator_ani
https://de.wikipedia.org/wiki/Musculus_pubococcygeus -> german as there is no specific english entry

longer article:
https://medium.com/@KevAlghul/how-to-orgasm-without-ejaculating-78ebcf91bcc9

(((JEWS))) hate this as it allows men to be coomers while retaining their seed but due to the high skilllevel needed its not trivial to do it. most want to relax and ease up while orgasm which WILL make you lose

having a habit of flexing ALL muscles while cumming (but then relaxing) since i am a 8 year old boy i think it should be easy to change this habit just a bit by not relaxing the PC-muscle
i kindly ask all anons who have done and / or mastered this technique to share their exoperiences and knowledge
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https://www.youtube.com/watch?v=t4kfgLYLD90

TL:DR

timestamp 13:50 https://youtu.be/t4kfgLYLD90?t=830 the young man abstained 30 days and this - according to his bloodwork - resulted in increased testosterone:

test from 7.2 ng/ml to 4.7 ng/ml
=> 53% increase
this is after only 30 days. full spermatogenesis is said to take 90 days (=3 months)

if you take into account somewhere it was stated the androgen-receptors get more "efficient" aswell while performing semenretention the total effective amount likely is even higher