There seems to be this ongoing stigma toward any and everything under 18. As a 24 year old I have sympathy for the under 18 crowd and I remember what it was like when I was a teenager and being treated like an elementary school child. Though the brain doesn't fully mature until well into your 20s and 30s, that doesn't mean that a teenager is dumb. And clueless.
Think back to when you were a teenager. Of course we all mature at different rates and some of us are a lot more sheltered than others but most of you knew the difference between right and wrong or creepy and not creepy.
Physical Attraction
We all see it every day. There is that young and insecure girl who wants to know how she looks so she posts a selfie and asks for honest opinions. 
I literally googled "bikini selfie" and this was the 4th picture on the screen which is my whole point. You can't tell who this girl is or how old she is. If a girl who is 18+ posts a selfie like this, people will shower her with compliments and then there is always that occasional creeper who will say things like "mmm can I see more of you?" Regardless if she is under or over 18, the comments will be similar however she will likely have comments saying things such as "Sorry, I can't comment on this because you are under 18." Just because someone is under 18 doesn't mean that they can't be beautiful. Not everything has to be sexual. She will also likely receive lots of comments patronizing her about how unsafe it is to post pictures like these, despite the fact that she isn't showing her face and she posted anonymously.
Sex
This is a big one so I'll divided it up into 3 segments. If there is any sex related question asked by someone under 18, he or she will likely be condemned to death by the over 18 crowd telling him/her that they shouldn't be having sex until they are 18 but there are a few things wrong with this statement.
1.) Most people under 18 are well aware of what sex is, they know what STDs are, and they know of the importance of wearing a condom and avoiding pregnancy and all other consequences that can potentially arise from sex. In fact, I see many more adults making sex-related mistakes than teens. It's not uncommon for me to see someone who is barely 19 with a baby and another one on the way.
2.) Teenagers need to learn about sex. It's very important to learn as much as you need to know about it before you start doing it, especially when your hormones are going crazy during your teenage years and all you are thinking about sex. As long as they aren't moving outside of their legal limits of consent then there shouldn't be a problem. Wouldn't you rather them learn the easy way than the hard way? Teens asking sex related questions shows that they are being responsible enough to ask questions before they act on what they do.
3.) 18 is not the universal age of consent people! In most countries around the world it's 14-16. Even in most states within the US, it's under 18. In fact, some countries have ages of consent as low as 12 years old!!
They are not stupid
Last but not least, teenagers are people too. We've all done things that we shouldn't have been doing as teens like having sex, trading nudes, sneaking out, drinking etc. Even to this day as full grown adults, we still do things that we shouldn't be doing but most of us knew then and still know what we were/are doing and the possible consequences and risks of them despite our age. If creepy guy comments on a bikini selfie of a 15 year old telling her how much he wants to do her, she's just as likely to ignore or block him as someone who is over the age of 18. Why? Because she has a brain!! We are taught from early on "don't talk to strangers" and it never goes away. As we grow older, we start to learn why our parents told us these things and when it comes to those types of dangers, it doesn't take people anywhere close to 18 years to figure them out.
In conclusion
Teenage years are some of the hardest of our life when it comes to figuring ourselves out physically and mentally. In this gray area of life, the last thing you need is to be constantly told that you are "too young" or that you're wrong. Patronizing someone soley due to their age especially without giving them valid reasons does nothing but feed the insecurities and confusion in this stage of their lives. I know for sure that before I turned 18, I knew what right and wrong looked like. I knew about safe and unsafe and if I ever moved outside of those barriers, I was careful not to get myself hurt or in trouble just as well as do most adults.
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