Iced
Of course we always have to talk in generalities. I think we tend to put too much emphasis on having the wrong kinds of things in common. Other things are a lot more important: ones that relate to the way you want to live your life, how you would want to raise children, beliefs about right and wrong, family, that sort of thing. Many people seem to think having things in common means something different, more like enjoying the same activities? It's not really our cultural norm, but I don't think it's worse in places where men and women's sexual relationships have a more limited sphere, and they have same sex relationships more for entertainment and such. I personally wouldn't want to have that as a strict norm, but I think it can work to split of those different parts of relationships. We often depend too much on our partners to inhabit a lot of different roles.
But as far as the potential for exploitation, I don't disagree that it's a possibility. I also think though that happens in many romantic relationships, maybe its just an inherent danger, and I am not convinced that the potential means they should all be disallowed. Lots of cases where there is a significant power imbalance are very good and respectful relationships. I guess we could have a law saying that until you are 18, you can't have sex with someone more than 5 years older, or something like that. But I wonder if that would really do much, you could still have an 18 year old having a relationship, even marrying, someone who is 40 years older. How many 16 year olds are really having relationships with 40 year olds?
I think a big part of the issue with young adults is that they are inexperienced. And we naturally want to prevent them making really significantly bad decisions because of their inexperience. I have wondered though, as I get older, if that doesn't end up pushing back the problem somewhat, so you now have relatively inexperienced 20 year olds making bad decisions. I think more brain maturity than we realise is driven by having experiences.