Okay you make some good points here. I still think an argument could be made that the "line in the sand" should be moved upwards a bit could be made and I find it weird more aren't making it in this whole age gap discourse.
Actually reviewing every single sexual relationship to determine all of the factors involved including age, relation, wealth, traumatic pasts, cognitive abilities, sobriety level, etc. is an insanely monumental task for any government. One that would involve massive invasions of privacy as well.
Bit idea: SciFi future where and AI tells you who you can and can't bone based on a complex algorithm to assess power dynamics.