Now, if it's ok for children to engage in sex with children, then why is it wrong, other than the draconian laws based upon archaic societal taboos, for children to have sex with adults?
Can they present an External, Transcendent, Objective Truth that declares such activity as immoral?
If not, then it's perfectly alright for consenting children to engage in sexual conduct, and even sexual commerce, with adults.
Once you exclude God and His law, no behavior is unacceptable. It is only Mankind's opinion, one way or another, and subject to the vicissitudes of the majority.
And if acceptable behavior is based only upon the opinion of the majority, then we mustn't be surprised when acceptable behavior continues its decline to the lowest common denominator.
If one thinks about it, an adult male is more able to provide for the expenses of young motherhood than a 12 year old boy is (or even to pay for an abortion). Not to defend the practice, just to say that "within 2 years" is just a bogus argument. They mean to do away with age of consent laws just as laws against unmarried sex (fornication laws), sodomy, and adultery have been done away with. Right now, age of consent laws are a joke because of "Romeo & Juliet/now "Romeo and Romeo" exceptions and a lack of willingness to prosecute for statutory rape.
Consent laws aren't really based on archaic taboos. Up until very recently, a 13 or 14 year old getting married and having kids was not unusual. Age of consent laws are a pretty recent innovation.
Age of consent laws are based on contract law: minors cannot legally enter into binding contracts and sexual relations are, legally speaking, a type of contract.