از مقعد به دهان
مقعد به دهان اصطلاحی است به این معنا که شخص در هنگام عمل جنسی آلت خود را از مقعد بیرون کشیده و بلافاصله در دهان شریک مفعول و یا شخص دیگری میگذارد. از مقعد به مهبل نیز اصطلاحی مشابهاست برای اشاره به فرو کردن آلت در فرج زن پس از بیرون کشیدن آن از مقعد.این اصطلاحات از سال ۱۹۹۵ میلادی رایج گشت. با وجود خطرات این کار از نظر بیماریزا بودن این عمل به یکی از رایجترین صحنههای جنسی در فیلمهای پورن تبدیل گشت که آنرا عملی لذت بخش توصیف میکند.قابل ذکر میباشد که بزاق ترشحی دهانی هر فرد باز هم نسبت به ترشحات عفونی خود شخص قابلیت ایستادگی را ندارد و قطعا پیش فاکتورهای اصلی عامل عفونی زا به مجاری دستگاه گوارشی راه پیدا خواهند کرد و خطر این روش بسیار زیاد می باشد و ریسک ناشی از آن بر عهده فرد مفعول قرار خواهد گرفت.
Ass to mouth is a colloquial term used in pornographic movies. It refers to the withdrawal of a person's penis from the receptive partner's anus followed by the immediate insertion of the penis into the receptive partner's or another partner's mouth.
Alternate terminology 
It is also known as A2M, ATM, ATG or ass-to-mouth. Ass-to-mouth generally excludes cleaning the penis or other object after its removal from the anus and before its insertion into the mouth. This may enhance sexual excitement for both insertive and receptive partners, often developing from connotations of domination/humiliation. Ass-to-other-mouth or ass-to-other-girl-mouth, abbreviated as A2OM, ATOM, A2OGM or ATOGM, specifically describes the variant of the act where the penis is moved from one partner's anus to a different partner's mouth. Another variation is known as A2P, ATP, or ass-to-pussy which refers to removing the penis from the anus and inserting it into the vagina.
Health concerns 
If the recipient of ass-to-mouth is performing fellatio on a penis or object that was removed from his/her own rectum, the health risks are generally limited to disturbances of the gastrointestinal tract, which may proceed from introducing normal intestinal flora from the rectum to the mouth and upper digestive tract. If the recipient's ano-rectal area is infected with a sexually transmitted disease like gonorrhea; however, there is an added risk of transmitting the infection to that person's mouth and/or throat.[dead link] as well as intestinal parasites and other organisms that can be carried in feces, but the risk exists generally only if performing the act on a penis or object that was removed from a third person's rectum. For example, the third person would have to first be infected with Hepatitis A for there to be a risk of infection for the recipient.
Some of the diseases that can be passed in the practice of ass-to-mouth involving a third person's rectum are gastroenteritis and enterocolitis, which are acute infections of the stomach, small intestine and/or large intestine, by gut flora organisms such as E. coli, Campylobacter, Shigella, Salmonella, or Yersinia, causing fever, vomiting, and diarrhea lasting for several days. Most other sexually transmitted bacterial diseases, like syphilis, gonorrhea, and chlamydia, can be transmitted by anal-oral contact. Viral diseases including hepatitis, herpes, cytomegalovirus, and human papillomavirus (the virus that causes cervical cancer and genital warts, as well as oral or laryngeal papillomas and carcinomas) can also be transmitted by this route.
It is unknown whether thoroughly washing the anal area and applying an enema results in reduced risk of disease, although general cleanliness is advisable for any sexual act. Porn industry performers often use enemas prior to filming anal sex sequences; however, this is primarily to eliminate the possibility of any fecal matter appearing on film rather than disease prevention.
Cultural references 
In the film Clerks II the main characters have a discussion on ass to mouth early in the film, and it is alluded to throughout the film. The main character, Dante, repeatedly scolds Randal, "You never go ass-to-mouth!" Later however, Dante's love interest, Becky, tells him, "Sometimes, in the heat of the moment, it's forgivable to go ass to mouth."
In Californication, character Charlie Runkle - Hank's agent with a soft porn addiction - is obsessed with ATM.
See also