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Saddlebacking describes the phenomenon of young people who claim to practice abstinence yet engage in anal sex as a means by which to ostensibly preserve their virginity while still gettin' it on. It basically comes from the idea that it "doesn't count" when you do buttsex-style or various other ways (parodied in Family Guy as "doing it in the ear").
It is a neologism coined by the readers of Dan Savage's weekly sex column. The term is derived from the Saddleback Church, an Evangelical outfit run by the Reverend Rick Warren, an outspoken homophobe, and seeks to point out the hypocrisy of what "abstinence" actually means for teens.
As abstinence-only programs tend to teach that contraception is wrong or ineffective, "saddlebacking" is likely to be done sans-prophylactic; this prevents one problem but creates another. The lack of a condom during anal sex increases exposure to fecal matter, leading to a greater risk of infection but its practitioners are also much more likely to transmit STDs such as HIV, and specifically viruses linked to rectal cancer such as HPV.
 Use of the term
The term may be used as follows: "After attending the Purity Ball, Heather and Bill saddlebacked all night because she's saving herself for marriage. Unfortunately her parents found out because they got santorum all over the sheets.  "
 Elsewhere in the world
Heterosexual buggery is common in countries where a girl's physical virginity (hymen) is highly prized. As such unmarried couples sometimes practice it in Muslim and Middle Eastern countries, notably Turkey.