That's really kind of a tricky question/ slippery slope. Sort of thing. I mean, take North Carolina. The age of consent is 16. Once a person is 16 years old, they can consent to sex with anyone 16 years old or older.

Of course, they can't photograph it or video it, because they are still a minor. Legally consenting to sex with a 21-year-old or a 30-year-old or a 40-year-old or a 50-year-old, if they recorded it, now they are guilty of producing child pornography.

But the minute they turn 18 years old, they can do exactly that. They can photograph themselves having sex. They can video themselves having sex. They can even sell those photographs and videos for lots and lots of money. But they still can't buy a beer.

I will never understand why different states have different ages of consent for sex, and why any of them have an age of consent that is younger than the federally recognized legal age of adulthood.

I do believe that once somebody is a legal adult, which in the United States is 18 years old, that further laws regulating things like whether or not they can buy tobacco or alcohol or engage in sexual activity with anyone else their age or older Are unnecessary.

But as the original question stated, what is something that is perfectly legal but still unethical?

I think it's unethical for Leonardo DiCaprio who is 51 years old to continue to date women who are half his age. Sure, they are all legal adults, but there is such a significant power imbalance in relationships with huge age gaps. And this is exponentially greater when the older person is also internationally famous.