Those attempts for discredit LGBT movements show the despair of anti-LGBT groups.
Sex must be always based in informed and free consent of all the parts involved. That consent can only be given by a mature adult, children and animals cannot give their consent.
Maturity it is not just a matter of age, but an age limit is much easier to implement.
In 2015, in my country (Spain) sexual consent age was raised from 13 to 16 years.