the prohibition of sodomy

 
 نِسَاؤُكُمْ حَرْثٌ لَّكُمْ فَأْتُوا حَرْثَكُمْ أَنَّىٰ شِئْتُمْ ۖ وَقَدِّمُوا لِأَنفُسِكُمْ ۚ وَاتَّقُوا اللَّهَ وَاعْلَمُوا أَنَّكُم مُّلَاقُوهُ ۗ وَبَشِّرِ الْمُؤْمِنِينَ– sura al baqarah verse 223-

 
  your wives are a tilth (a planted ground) for you, so go to your tilth, when or how you will, and send (good deeds, or ask allah to bestow upon you pious offspring) for your own selves beforehand. and fear allah, and know that you are to meet him (in the hereafter), and give good tidings to the believers (o muhammad صلى الله عليه وسلم)
 

it is forbidden for a muslim man to enter his wife in her anus. this is understood from the verse quoted above (i.e. since "a planted ground" can only refer to a place where something might grow), and from the narrations cited above. there are also other hadith on the subject, among them:

•first: on the authority of umm salama who said: "when the muhajireen came to ansaar at al-madeenah, some of them married women from the ansaar. the women of the muhajireen used to lie on their faces (during intercourse), while the women of the ansaar never did it that way. then, one of the men of the muhajireen wanted his wife to do that. she refused until such time as she could ask the prophet about it. she went to the prophet but was embarrassed to ask the question, and so umm salama asked him. then the verse was revealed which says: "your wives are as a tilth unto you; so approach your tilth when or how ye will;" [al-baqarah 2:223]. the prophet (pbuh) said: "no! (not any way you wish) except in one opening! (ie. the vagina)". [ahmad, at-tirmidhee and others : saheeh]
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•second: on the authority of khuzaima ibn thaabit who said: "a man asked the prophet about entering women in the rear, or the entering by a man of his wife in her rear, and the prophet (pbuh) answered: `halaal (ie. permissible).' when the man turned to leave, the prophet (pbuh) called him or ordered for him to be called back and said: "what did you say? in which of the 2 openings did you mean? if what you meant was from her rear and in her vagina, then yes. but if what you meant was from her rear and in her anus, then no. verily allah is not ashamed of the truth - do not enter your wives in their anuses!" [ash -shaafi, al-baihaqi and others: saheeh]
•third: "allah does not look at one who comes to his wife in her anus". [an-nasaa'ee: hasan isnaad and supported in "al-'ishrah"; at-tirmidhee and ibn hibbaan].
•forth: "cursed are those who come to their wives in their anuses." [aboo dawood, ahmad and others with hasan isnaad and is supported].
•fifth: "whoever has sexual intercourse with a menstruating woman, or a woman in her anus, or approaches a soothsayer and believes what he is told, has disbelieved in that which was revealed to muhammad (pbuh)” [aboo dawood, at-tirmidhee and others: saheeh].
medicine in this century has shown that over 70% of men are infected with hiv when they have anal sex with women.
the man knows that diseases of syphilis, gonorrhoea and genital ulcer disease are diseases transmitted from men to women and vice versa during sexual intercourse. then in this century, everyone was surprised by the appearance of the disease aids (acquired immunodeficiency virus) because of homosexuality.

medical experts testified that the man's sperm contains unsaturated fatty acids known as prostaglandins, the number known so far amounts to about twelve, each of whom has a different way from others, and in different tissues. these substances affect the immune system and weaken it and reduce the production of lymphoid cells resulting in immunodeficiency in humans.

it is obvious that the man puts the semen in the vagina of the wife, and this is the order of allah in his book, and the prophet (peace and blessings be upon him) in his sunnah.
it has been found that the secretions of the uterus have some contrast materials that are equivalent to the existing materials in the sperm of men, so when the man puts the sperm into the woman's vagina this do not decrease the immunity.

with this, we realize the wisdom of allah when banned homosexuality and lesbianism, and anal sex with the wife, and ordered to refrain from women during menstruation until they purify themselves.

all this new information is not new to islam, because allah stated in the quran 1400 years ago.