Above: a liger
Here is a quote from a National Geographic article:
“The act of mating with a species other than your own may not be as ill advised or peculiar as it seems.[...] A growing number of studies have been presented as evidence that two species can combine to produce a third, sexually viable species in a process known as hybrid speciation[...] Scientists now believe that the behavior [inter-species sex] that has been called animals’ sexual blunders could be an important force in their evolution. [...] ‘In the past, people have often viewed hybridization as a mistake’ Mallet said. ‘But this is probably not an unnatural phenomenon. And, he said, ‘Sex with another species may occasionally be a very good idea.[...] It might be worth throwing the dice every now and then to trying for something really weird and see if it works out.’ Occasionally, [inter-species sex] produces sexually fertile offspring that may have the opportunity to evolve into a separate species.” — http://news.nationalgeographic.com/news/2007/03/070314-hybrids.html
Relating to the above quote, this is what I said in another post:
“If a human and a dolphin have sex, chances are high that there will be no fertile offspring. However, there is a slight chance that a new species (human-dolphin hybrid) could be produced. The above quote comes from the National Geographic article ‘Interspecies Sex:
Evolution’s Hidden Secret?’ It suggests that there is nothing wrong with interspecies sex because it is a normal part of nature. The only reason humans do not usually engage in inter-species sex is because irrational ways of thinking (such as religious dogmas) are acting as a straight jacket, preventing them from doing what nature intended. Remember, because humans are animals, they can have inter-species sex just like any other species. Because inter-species sex is a normal part of nature (and a beneficial part of nature), why should humans avoid it? By not having interspecies sex, the human race is actually weakening itself in the long run.” — Vivid Random Existence
The fact is, because other species have inter-species sex, humans should too — it is a part of nature. In fact, here are some species that have been created through inter-species sex: The liger and tigon are both formed through interspecies sex, as are the zonkey (or zebroid) and and the grizzly-polar bear hybrid. All of these creatures were created when an organism from one species had sex with an organism from another species. Because inter-species sex is an important and integral part of nature, it seems odd that people refuse to have sex with animals of different species.
Also, here is a quote from http://www.mindprod.com/humanrights/taboo.html:
“Now that the planet is overpopulated, the taboo [of having sex with animals] is obsolete. Condoms could prevent disease in the same way as with humans. The issue of informed consent still applies, though the notion of informed consent is a bit silly given that all animals manage to give or refuse it with body language.” — http://www.mindprod.com/humanrights/taboo.html
The above website (mindprod.com) also says that there were three reasons why people originally (centuries ago) did not accept sex with animals: to stop the spread of diseases, to maximize procreation, and to assert human superiority. The above quote argues that now, these reasons are meaningless because of our advanced and technological 21st century society.