They don’t care about it being consenting adults when they start teaching it in elementary schools and encourage children to have sex all through their school years.
The first law to be struck down after homosexuality was legalized for everyone from coast to coast was to lower the age of consent for persons of the same sex from 18 to the same for heterosexuals (meaning adults and minors could “consent”).
The consenting adults meme was all just a selling point. The agenda goes much deeper than that.