NOTE: This is not about whether homosexuality is natural or not. I am also not trying to offend anyone. Please read the following paragraph before voting and/or reporting me.
Anal sex has been practiced by civilizations throughout time for thousands of years and is known to be pleasurable for both men and women (arguably more so for men because of the location of the prostate). On one hand, most people don't consider anal sex a "natural" form of sex because the anus, aside from its mucous membrane, does not naturally produce a lubricant. In addition, vaginal sex is considered the "natural" form of sex because it leads to reproduction. On the other hand, anal sex is usually extremely pleasurable and commonly practiced, currently and throughout history. In terms of anatomy, the anus has many, many sensitive nerve endings and is obviously receptive to penile penetration. Is the anus "meant" to bring pleasure and be penetrated? Or is it simply a coincidental byproduct of evolution (or creation, if you believe in that)?
Intercourse's "original intent", as some would define it, is to reproduce so I don't really think it is going by that but hey, Sex should be for pleasure so why not.
Let me just go back to bed 
