It is written regarding the creation of Adam and Chava: Vayevarech otam vayikra et shemam Adam, “He blessed them, and called their name Adam [man]” (Bereshit 5:2). Torah is very clear to reveal that G-d called them ‘both’Adam. In this way, He established that the spiritual nature of a human being is only completed in the world through the union of the ‘two distinct human aspects’, to wit, the masculine (corresponding to the active spiritual force and of expansion), and the feminine (corresponding to the passive spiritual force and of restriction). These spiritual forces embodied in the human being – and that exhibit such opposing functions – when united in the sanctified manner, form a ‘well balanced physical-spiritual pair’. This means a single being mirroring his origen in one common soul before its descent to this world and division into sexes. In fact, through this balance, flow all Divine blessings to the couple; and the whole world benefits from this most pleasing of unions in Shamayin. And as it is written, “When a couple lives in accordance to Torah law, the forces of Creation – the letters Yud and Hei from the holy Tetragram – reside with them. Then, in time, they become the image of the holy forces of Creation” (Tikunei Zohar, Tikun 10b). And it is also written that, “Who is incomplete below [i.e., not married] remains incomplete on high [i.e., spiritually]… And Ya’acov [the perfect patriarch]…alo, until his marriage was not complete” (Zohar 150a, Vayetze).
Now, our Sages, all of blessed memory, have openly cautioned us: Kedoshim tihiyu hevu persuhim min ha-arayot u-min ha-evera, “Distance yourself from the illicit relations and from sin” (Rashi at the beginning of Parashat Kedoshim). And “of all isurei ha’arayot, only regarding the avon [sin] of Mishkav Zachur the Torah uses twice the word Toeva [Vayikra 18:22]. The Talmud explains that Toeva is Toe Hu Ba, which means that ‘he is making a mistake in this’… That is, ‘this’ is against human nature! It is the type of avon that exists only to challenge G-d. It is something that comes from the anger which feeds this abominable rebelliousness” (R’ Moshe Feinstein, Teshuvah, Chelek 4 siman 115). And the Torah is also quite clear regarding the grave punishments of these forbidden unions, including that which occurs to the person committing these transgressions after he dies. The mekubal, HaRav Yehudah Fatiyah, the greatest student of the Ben Ish Hai, in his Sefer Minchat Yehudah describes his many conversations with tormented ruchot (spirits) which commited these abominations in life. They relate with terror the severity of their spiritual punishments! After all, not only from this transgression’s zera levatalah the sitra achra gets nourished and demoniacal beings are brought to life, but also each drop of semen spilled in vain implicates on the destruction of potential (unborn) children, which become imprisoned in the clutches of the klipot. Moreover, the ejaculated semen in a domain ‘absolutely improper’ deflowers these poor souls in a most perverse and horrible manner! Contrary to an union between man and wife which fulfills the mitzvah of procreation and gives the fruits of children (G-d willing), if oral sex occurs in this sin, chaz v’shalom, then the only thing fulfilled are the spiritual deaths of the children which are as if “swallowed” in this most merciless abomination! Yet, regarding these rebellious ones, all members of the Erev Rav, it is written: “They all alike have broken the yoke, and burst the bonds… a wolf… shall destroy them… because their transgressions are many, and their apostasies are great” (Yermiyahu 5:5-6). Additionally: “The wicked with their sins pollute both themselves and the Sanctuary [i.e., they contaminate the earth], and bring a ruach rah [an unclean spirit] upon themselves; but in time to come G-d will purify Israel and remove from them the unclean spirit” (Zohar 54a, Metzora). This ruach rah is the wicked Nebuchanetser, “who was deprived of his kingdom and he dwelt with the beasts of the field, his human countenance was taken away from him and from that day he did not bear the impress of a man” (Zohar 125b, Mishpatim) – and was only to bear the image of a wolf! And as it is known, “Nebuchanetser used to tear the flesh of a live rabbit and eat it” (Eicha Rabah 2:14), and Kabbalah says that, “He who has homosexual relations is reincarnated as a rabbit” (the Ari”zal, Sha’ar HaGilgulim, Hakdamah 22, end).
Each and everyone who is involved in this most grievous of sins must use all of his kochotha-nefesh (spiritual forces) to do teshuvah and implore Hashem’s mercy.
As it is brought in Kabbalah, “For during all those  years that Adam kept away from his wife [Chava, to ‘know her’], unclean spirits came and conceived from him, and bore offspring, which are called ‘plagues of the offspring of Adam’ (Zohar I:169b, Vayishlach). The ‘unclean spirits’, known as sexual shedim/demons, are called Lilim yemach shemo, and have origin in the feminine shed Lilit, yemach shemo. These are “impregnated” (see Avot d’Rebbi Natan 37:3) from the spiritual energy of semen (spilled in vain) which was ‘not’ used in kedusha (and in this manner, impurify man) and give birth to the ‘plagues’ – another class of shedim – which flit about in the world ‘filling the atmosphere’ together with the other hordes, such as the mekatrigim/accusers (see Zohar 190a, Vayeshev; 196b, Balak; R’ Chayim Palachi, Kaf HaChayim 240). Moreover, this progeny of shedim is very “special”, being that they are hybrid creatures of demoniac-souls (i.e., human neshamot that have no guf/body to be connected to, plus the Lilim,yemach shemo), which steal and so ‘starve these poor souls of their great vital energy’ (see Bamidbar Rabbah 16:25) since each neshama that is brought down from its source above receive spiritual sustenance.
Now, by Divine law, these plagues are as much considered the person’s children – for he was responsible for their fathering – as are their own children of flesh and blood in the world! These demoniac-souls then hunt their ‘causers of suffering’ (not the Lilim yemach shemo, but their human parents that initiated all these sufferings for them), staying close to them and seeking to siphon their spiritual energy. When a man dies, these ‘rebellious children’ accompany his coffin to the cemetery, mourning hin as now they cannot cling to that space and claim it (R’ Chayim Palagi, Tochachat Chayim, Shemot, pp. 29-30.). And as it is written, “When a man goes to the side of the Left and walks in impurity, he draws to himself all kinds of impure spirits, and an unclean spirit clings to him and refuses to leave him since these spirits cling only to those that cling to them first” (Zohar 55a, Bereshit). This connection causes man great mental confusion and the machshavot zarot/strange thoughts in his life and vengeance from these plagues on the afterlife! (ibid. Tochachat Chayim) Human beings are forbidden to father these “children”, for they profane the world and man, and seek to dominate humanity. This is contrary to G-d’s Law, which affirms: “Be fruitful, and multiply… and have dominion over the birds of the air” (Bereshit 1:28), to wit, all celestial creatures, for only “man was created in His image” (ibid. 27). It is good that man remembers in the image of Who he was created, so he can be one who is happily walking the straight path, “For the upright shall dwell in the land, and the innocent shall remain in it” (Mishlei 2:21), amen.