Why is it ok for women to be with teenagers but not men?

18 year old boys are so immature it's creepy for a 40 year old woman for example to sleep with them but people think it's ok

But if it's a 40 year old man with a 18 year old girl people have all kinds of excuses.

It makes no sense to me I think both are OK.

Why is it ok for women to be with teenagers but not men?
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