BS! Animals are property, if cruelty was really your crusade then you should also be lobbying against them being delicious food. Im betting youre either a PETA person or a hypocrite which is it? BTW youre welcome to prove that animals dont enjoy having sex with humans, that might be interesting.
Child abuse only if they didnt consent and guess what, plenty of 13 year olds have the mental capacity to consent only arbitrary law prevents them. And what is the basis of arbitrary law??? MORAL JUDGEMENT!
Statutory rape doesnt apply to consenting adult relatives so save your moral outrage for someone who cares. But given your logic, Those things do hurt people. Same-sex relationships don't then two adult brothers must be OK by YOU! Right?
Two things on the bestiality comment: first, raping an animal is animal cruelty, which is illegal. Humane killing of animals for food is not illegal. Secondly, there is a strong correlation between people who have sex with or otherwise abuse animals and those that go on to commit acts of abuse or other violence against people. Research most of the famous serial killers (Henry Lee Lucas and Jeffery Dahmer to name a couple) and you will find that they had a history of torturing or raping animals.
13 year olds do not have the capacity to consent to sex with an adult. That's why statutory rape laws exist, to prevent to abuse of children and teens who are persuaded into sex by predatory adults. Are you telling me that child molestation is ok as long as there is no struggle or as long as the child or teenager likes the person that is raping them?
Incest is illegal because it usually concerns parents or older siblings sexually abusing children in their homes. Adult incest is illegal because of the public health concerns with two close relatives producing offspring who are many times more likely to have congenital defects because of homozygous genetic diseases. That's why in some states, you can marry your 2nd cousin, and in others the closest relative you can marry is your 4th cousin.
Again, two consenting adults having a sexual relationship violates no one's rights to life, liberty, or property, while the above situations involve victims or public health/order violations.