Very intresting article!!! I new some of the facts, but not all of them. Sexuality it is seem as an extreme - either a taboo subject, either a very trivial one. But this energy is everywhere - the birds are singing because they are calling their mates.
Some of the behaviors you just described might seem "sick", but they are just cultural different. I read also a lot about the female genital mutilation that it is still happening VERY often in African countries...
That is, many for discomfort prefer not to touch the subject, but is something totally normal, so be different in other cultures is something that arrives sooner or later, the article was made to emphasize other methods not usual in sex, but it is as you say, is cultural and is a Derec Ho that we all have, good that you liked the post, Greetings :D