Why is it considered "wrong" to have sex under the age of 18?

is it a religious thing, you kno "no sex before marriage"? why is it that it is the public view that when you're under the age of 16 or even 18 that one should not be involved in sexual activities? why would parents disapprove of their child having sex even if they know they are using protection and... show more is it a religious thing, you kno "no sex before marriage"? why is it that it is the public view that when you're under the age of 16 or even 18 that one should not be involved in sexual activities? why would parents disapprove of their child having sex even if they know they are using protection and what not?
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