Come on, that's like saying women can't enjoy a relationship because ISIS rape women in Syria. Not all relationships are negative just because some are.
Personally I favour something similar to Goku. I'd say remove age of consent altogether, but change the legal system a little.
You'd have a close-age requirement for people under 18 (for example 2 years up to 15, 3 years above that) , and exploitation protection for people up to 21, or people with learning difficulties or otherwise dependent. I'd also change the Law so that breaking the close age requirement isn't rape, it's sex with a minor which carries a lesser penalty. Because not all sex with minors is non-consensual even if it's a definite moral grey area.