Many researchers have described homosexuality as something altogether different from sex.

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Meetings between different dolphin species can be quite violent, but the tension is often broken by a "sex orgy".

Homosexuality is a social phenomenon and is most widespread among animals with a complex herd life.

Homosexual behaviour has been observed in 1,500 animal species.

"We're talking about everything from mammals to crabs and worms. Among some animals homosexual behaviour is rare, some having sex with the same gender only a part of their life, while other animals, such as the dwarf chimpanzee, homosexuality is practiced throughout their lives." Animals that live a completely homosexual life can also be found.

But green sea turtles aren’t alone: for certain reptile and fish species, the outside temperature determines the sex of their offspring.

That means that as global temperatures continue to climb, entire populations could wind up becoming all male or all female, which would make reproduction a challenge.When you see a colony of black-headed gulls, you can be sure that almost every tenth pair is lesbian.The females have no problems with being impregnated, although, according to Petter Boeckman they cannot be defined as bisexual.The pairing of males and females is fleeting, while between males, a pair can stay together for years.Homosexual sex between different species is not unusual either."To turn the approach on its head: No species has been found in which homosexual behaviour has not been shown to exist, with the exception of species that never have sex at all, such as sea urchins and aphis.