The last three things are offenses inflicted by one person onto another against their will and this is quiet clearly wrong.
Homosexuals don't inflict their homosexuality onto others against their will. It's quite clearly a different belief.
The last three are crimes against other unwilling people and are quite clearly wrong, independant of a lot of belief systems. These crimes against other unwilling people who have been deprived of their liberty to act how they like personally should be punished by the state.
However, wheres the crime in someone being homosexual against no choice of their own? They don't hurt other people with it. They don't inflict things unto other people unwillingly, its carried out between adults who know whats going on and consent. Where’s the obvious crime? Is this really as bad as depriving someone else of their liberty and inflicting adverse conditions onto them against their will? Quite clearly not.
Those were three examples. Let me give you more.
What about incest? It's uncommon but not non-existent and is also illegal in most (all?) countries. People are born with tendencies to sleep with their own family members. Watchya gonna do about it?
Also, bestiality. Animals will enjoy intimate behavior with species and non-species because at the end of the day they're animals and there are not many things more enjoyable to them than copulation. You have their 'required consent' which is what I believe is your criterion for something to be legal and morally OK. You're keeping everyone happy (with the added bonus of being environmentally friendly since you're keeping animals happy too) and you now have a blank cheque to do whatever you think is best.
Oh and let us not forget the fundamental problem that has been marring the Western society for decades; under-age sex. 18 is just a number. Kids can mature long before that age mentally (or conversely not have any sense of direction even years after they become 18). The only thing that's stopping them are state laws. Maybe soon we can have a bill that grants children with high IQs and good grades 'the right' of choosing their own sexual partner. That'll spare parents the trouble of forcing their kids to study too. Brilliant!
As for the argument that animals show homosexual behavior too, it's the flimsiest, stupidest, dumbest argument in favor of homosexuality I've ever heard. Animals will engage in intercourse whenever they want, with whoever they want and in whatever way they want for the reason given above. If you've also failed to notice, animals also run around naked and fight like hell for territorial rights. Some animals also show cannibalism. Oh and I've personally seen a chimpanzee pee into another one's mouth in a zoo. It is ultimately our choice if we want to act like sane humans, or like animals.