Ow but it still is very much taboo on a certain level. Lots of women enjoy receiving anal sex, few will openly let others know this. Lots of men also enjoy a finger or tongue up there, few will let others know this. There is a shame in to admitting that you've tried it, and there is a shame in admitting that you like it.
[–] ToFat2Fish 0 points 9 points 9 points (+9|-0) ago
Probably when it started receiving endorsements from the Catholic Church
[–] RedditDead2005-2015 0 points 1 point 1 point (+1|-0) ago
The power of the media (which includes porn). Porn was taboo in the 70s. Anal sex and interracial sex were rare back in the 80s. Show it enough times, and it becomes part of the norm. It works like that in the media too. Have a gay character in every show and it soon becomes normal to see gays even though they are only 2% of the population.