I guess I'll have to state the obvious for a third time to get it through your thick skull.
Just because a certain state doesn't codify into law that a certain action is illegal, doesn't mean the action isn't immoral and/or twisted.
For example, MANY states don't have laws against bestiality.
In your small twisted mind, than means every one of those states is telling X-Files it is ok to fuck a horse and a goat.
Is it clear now?
Idiot.
In one case you have no specific law against something which can be and has been prosecuted with other laws [hence no need for a specific law against it], whereas in the other you have specific age-in-exemption laws allowing it. IOW, my friend, these are apples and oranges.
In the case of Colorado it is a situation where they have made a specific law or laws that are close-in-age exemptions, also known as "Romeo and Juliet laws", to the legal age of consent law that allow certain minors to have sex with certain adults, etc. Colorado, as just one example of a state that has done that, has gone to a lot of thought and trouble to have these laws in place and they believed them to be right.
If they had believed their age-in-exemption laws were wrong or immoral they wouldn't have made them and might have enacted laws making such a crime as other states do. Obviously they don't agree with those states that make 15 and 18 year old closed mouth kissing or all night sexathon orgies a crime punishable by up to 20 years in prison.
(That doesn't mean Colorado thinks every 15 year old has a perfectly healthy moral sex relationship with a 20 year old just as the same could be said about two 17 year olds or two 40 year olds.)
This is quite different from there being no specific law against something, since lawmakers have found no need to make such a law, as it may very rarely occur {unlike the above Colorado laws) and/or be of little interest to lawmakers, and there may be various valid reasons for that. For example, in the case of beastiality, even where there is no specific law against it, it may still be prosecuted under other laws, and there are cases where this has occured.
"Even if bestiality is not explicitly prohibited, there are often many other laws which can be used to effectively prosecute cases. For example, most countries have animal cruelty laws, and a prosecutor will argue that all zoophilia activity is animal abuse, even if no harm was done to the animal.[11] In some U.S. states, a person who engages in bestiality can be charged with animal "cruelty" even if the animals involved are not injured.[12]
http://en.wikipedia.org/wiki/Zoophilia_and_the_law
So your argument was a half decent attempt, i guess, but it won't make shit fly as you seem to be letting your biases blind you to the obvious, while certainly grasping at straws and spitting into the wind.
"Many states have changed their statutory rape laws to fit this definition, adopting a new class of statutory rape that stipulated that a teenager can legally have consensual sex with a 14, 15, or 16 year-old provided that the other sex partner is within four years of those ages."
http://sex-crimes.laws.com/statutory-rape/romeo-and-juliet-laws