What is the actual reason for this? Like in psychology, neuroscience or evolutionary psychology not memes.

>power imbalance
When I was 14 girls were going "ew" and "ick" and ostracizing me just because I sat too close to them in class or something Girls are incredibly hostile for even trivial reasons, so they will make it very clear when they do not like something and by the time they are 18 they are certainly capable of doing so. They aren't going to have a relationship with someone they are utterly disgusted by just because he drives a car and can buy alcohol.

>brain doesn't fully develop until 25
This is misinterpreted data. You reach your max white brain matter at age 25, but a 20 year old has the same amount as a 40 year old, you have like 98% of your white brain matter by age 18.

>they have nothing in common
So I can't date black chicks now? Because they have a different taste in music and whatever? Even if society were to dictate you can't date anyone you have nothing in common with, how do you determine they have nothing in common? This is just an incredibly flaky argument.

>he just wants sex
Of course some men just want sex not a committed relationship, but even if true, is it any more wrong than some dude wanting an older woman for sex? How many relationships are formed because 2 people find each other attractive and later get into each others hobbies and interests and their love grows? How many guys are terrible people but hot and get showered with obsessed fangirls? Are we going to lie about human sexuality? If you want to go back to puritanism and shotgun marriages, we can arrange that, but you have to be consistent. Further, how do you determine he is only interested in sex? Do we ask Karen for her opinion?

>pedos
I sometimes see threads with pedos saying "it's hebephilia ackchually", I don't give a shit about that. 18 is a good rule, if you go under you're a pedo, if you go over you've done nothing wrong.