Need to be a bit more age specific. 18 is the legal age for being an adult. So if he's under 18 there is no law broken. Also if she's 15 and he's 18 there may be no law broken depending on the state as many states now have a 4 year law. Also some states have laws saying if the relationship was prior to one's turning 18 there is no crime after as its an ongoing relationship.

All depends on the exact ages and state laws. However a minor does not have the legal ability to consent to sex period but since minor/minor would be a double crime with no seen offender its seen as a no crime instead.

If you are under the age to give legal consent then you can't give consent no matter the age. And 15 year-olds should not be having sex unless they want to ruin their lives and become yet another statistic!

You cannot legally give consent until you are 16.

It is illegal for him, not for her.

yeah it is, under 16's are not allowed to give consent to under-age sex, its the law sorry

You can't consent to anything legally if you are underage.

Yep...

The law says, you don't have the authority to consent at below that age.

The trick then becomes - to not tell the authorities.

Well, let us not forget that Mary was only 14 when she gave birth to Jesus.

Man changes laws for his own benefit.

The Laws of man are usually devised out of convenience ...not out of morality!

yes.