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In answer to the question, and I don't know if this is a major factor or not, but it's hard to "finish" in the back door. Assuming that "longer to finish" equals "better finish" (more pressure build up) that could be a reason.
Other reasons: subjugation/humiliation (which either the top or the bottom might be into), the 'taboo' --we're doing something naughty, the 'special event' aka wife says "I'm giving you something different tonight", the aesthetic --large thing disappears into small thing, or the general featureless of it, and
a HUGE factor
it feels good to the girl
as far as 'internal' O and 'external' O, some girls can only 'internal' O from the back door. and as far as external stimulation, the increased friction and accompanying 'displacement' of skin could work it's way up to the C button (which is incidentally the very tip of a LARGE INTERNAL ORGAN that they don't teach us about in anatomy textbooks)
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There's a level of facility that everyone needs to accomplish, and from there
it's a matter of deciding for yourself how important ultra-facility is to your
expression. ... I found, like Joseph Campbell said, if you just follow whatever
gives you a little joy or excitement or awe, then you're on the right track.
. . . . . . . . . . . . . . . . . . . . . . . . . . Terry Bozzio
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