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The frogposter is right.
At the first gate stands the angel ASTRKH, under his command are hundreds of thousands of deputies. They are appointed on all those who have wasted seed, who do not get to see the shichinah. These people defiled themselves in this world, therefore after death they are gathered by these angels who impose judgment upon them.
(Otzar Hmidrashim second chamber)
"Bad in the eyes of G-D” like the sin of Onun, who would spill his seed.
(Rashi Berashis 38/7)
“and also their children” this was counted as murder, meaning they wasted seed and did not repent. (Rashi Yichezkel 23/37)
This was the flaw of the generation of the flood, they would waste their seed. (Rashi Shabbos 41)
Semen is the energy of the body and the light of the eyes. As long as it is excreted in excess the body withers and life is lost. All those that are saturated in this, old age jumps on them, his strength leaves him, his eyes go weak, bad breath pours out of his mouth. His hair and eyebrows fall out, the hair of his legs and armpits become thick and his teeth fallout. Many additional health problems occur.(Shulcan Aruch 240 Rambom, Dayot)
It is prohibited to emit seed in waste. Those that do are put into excommunication, and it is as if he killed another person.
(Rambam esuray biah 21/18)
One who spills seed, bais din is commanded to place him in cherem.
(Ramban M.M. E.B. 21/18)
It is prohibited to waste seed. Those that do it, not only is it a serious sin they also place themselves in spiritual excommunication and is equivalent to an act of murder. (Tur A.H. 23/1)
One is not allowed to spill seed. This is the most severe transgression from all sins in the torah. A person is not allowed to purposely cause an erection or bring himself to think impure thoughts. (Shulcan Aruch A.H. 23)