건강상의 위험
http://www.jrsm.org/cgi/content/abstract/86/3/144
http://www.jrsm.org/cgi/content/abstract/86/3/144Anal Intercourse and Fecal Incontinence: Evidence from the 2009–2010 National Health and Nutrition Examination Survey
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5231615/http://www.jrsm.org/cgi/content/abstract/86/3/144
http://www.jrsm.org/cgi/content/abstract/86/3/144Anal Intercourse and Fecal Incontinence: Evidence from the 2009–2010 National Health and Nutrition Examination Survey
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5231615/
남성과 남성
Increases in Unsafe Sex and Rectal Gonorrhea Among Men Who Have Sex With Men -- San Francisco, California, 1994-1997
https://www.cdc.gov/mmwR/preview/mmwrhtml/00056314.htmIncreases in Unsafe Sex and Rectal Gonorrhea Among Men Who Have Sex With Men -- San Francisco, California, 1994-1997
https://www.cdc.gov/mmwR/preview/mmwrhtml/00056314.htm
남성과 여성
https://www.cdc.gov/nchs/data/ad/ad362.pdf
https://www.cdc.gov/nchs/data/ad/ad362.pdfArchives of Sexual Behavior
https://www.springer.com/journal/10508Our Sexuality
http://books.google.com/books?id=MpRnPtmdRVwC&pg=PA286&lpg=PA286&dq=+outercourse&hl=en#v=onepage&q=%20outercourse&f=falseOur Sexuality
http://books.google.com/books?id=MpRnPtmdRVwC&pg=PA560&dq=&hl=en&sa=X&ei=cFuJUfH3JaP30gHb4oDwBg&ved=0CDEQ6AEwAA#v=onepage&q=&f=falseAttention Required! | Cloudflare
http://www.askmen.com/love/vanessa/23b_love_secrets.htmlhttps://www.cdc.gov/nchs/data/ad/ad362.pdf
https://www.cdc.gov/nchs/data/ad/ad362.pdfArchives of Sexual Behavior
https://www.springer.com/journal/10508Attention Required! | Cloudflare
http://www.askmen.com/love/vanessa/23b_love_secrets.htmlOur Sexuality
http://books.google.com/books?id=MpRnPtmdRVwC&pg=PA286&lpg=PA286&dq=+outercourse&hl=en#v=onepage&q=%20outercourse&f=falseOur Sexuality
http://books.google.com/books?id=MpRnPtmdRVwC&pg=PA560&dq=&hl=en&sa=X&ei=cFuJUfH3JaP30gHb4oDwBg&ved=0CDEQ6AEwAA#v=onepage&q=&f=false
구조와 자극
웨이백 머신 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EC%9B%A8%EC%9D%B4%EB%B0%B1_%EB%A8%B8%EC%8B%A0Talk Sex with Sue Johanson
https://web.archive.org/web/20150408094551/http://www.talksexwithsue.com/aspot.php404 Not Found
http://www.talksexwithsue.com/aspot.php웨이백 머신 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EC%9B%A8%EC%9D%B4%EB%B0%B1_%EB%A8%B8%EC%8B%A0Talk Sex with Sue Johanson
https://web.archive.org/web/20150408094551/http://www.talksexwithsue.com/aspot.php404 Not Found
http://www.talksexwithsue.com/aspot.php
항문 성교
책 찾기 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%ED%8A%B9%EC%88%98:%EC%B1%85%EC%B0%BE%EA%B8%B0/978-92-4-156347-5국제표준도서번호 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EA%B5%AD%EC%A0%9C_%ED%91%9C%EC%A4%80_%EB%8F%84%EC%84%9C_%EB%B2%88%ED%98%B8Attention Required! | Cloudflare
http://whqlibdoc.who.int/publications/2007/9789241563475_eng.pdfhttps://www.cdc.gov/std/stats08/2008survFactSheet.PDF
https://www.cdc.gov/std/stats08/2008survFactSheet.PDFhttps://www.cdc.gov/std/stats08/surv2008-Complete.pdf
https://www.cdc.gov/std/stats08/surv2008-Complete.pdfThe Ultimate Guide to Anal Sex for Women
http://books.google.com/books?id=bG8XqRO6rRQC&pg=PA15&dq=a+thin+membrane+is+all+that+seperates+the+vaginal+cavity+from+the+rectal+cavity&hl=en&ei=hO22TqG0LsGHsgKd3Lz7Aw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDIQ6AEwAA#v=onepage&q&f=falseThe Ultimate Guide to Anal Sex for Women
http://books.google.com/books?id=bG8XqRO6rRQC&pg=PA3&dq=Tristan+Taormino+prefer+anal+to+vaginal&hl=en&ei=qu62Ts-YJZPJsQL42pzzAw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDQQ6AEwAA#v=onepage&q&f=false책 찾기 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%ED%8A%B9%EC%88%98:%EC%B1%85%EC%B0%BE%EA%B8%B0/978-92-4-156347-5국제표준도서번호 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EA%B5%AD%EC%A0%9C_%ED%91%9C%EC%A4%80_%EB%8F%84%EC%84%9C_%EB%B2%88%ED%98%B8Attention Required! | Cloudflare
http://whqlibdoc.who.int/publications/2007/9789241563475_eng.pdfhttps://www.cdc.gov/std/stats08/2008survFactSheet.PDF
https://www.cdc.gov/std/stats08/2008survFactSheet.PDFhttps://www.cdc.gov/std/stats08/surv2008-Complete.pdf
https://www.cdc.gov/std/stats08/surv2008-Complete.pdfThe Ultimate Guide to Anal Sex for Women
http://books.google.com/books?id=bG8XqRO6rRQC&pg=PA15&dq=a+thin+membrane+is+all+that+seperates+the+vaginal+cavity+from+the+rectal+cavity&hl=en&ei=hO22TqG0LsGHsgKd3Lz7Aw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDIQ6AEwAA#v=onepage&q&f=falseThe Ultimate Guide to Anal Sex for Women
http://books.google.com/books?id=bG8XqRO6rRQC&pg=PA3&dq=Tristan+Taormino+prefer+anal+to+vaginal&hl=en&ei=qu62Ts-YJZPJsQL42pzzAw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDQQ6AEwAA#v=onepage&q&f=false