Because I don't think many people here understand what "explicit" means or the fact that "TEEN" encompass a wide range of details to it. Unless the comics in question has genitalia and direct sexual interaction, than frankly, there's no problem.
It's already been said.
Moaning, isn't explicit.
Bodies touching, isn't explicit.
Nudity by itself, isn't explicit.
Your screen shot of "Egoism" isn't explicit. All I see is three shirtless boys up against one another. Maybe they're on the swim team an the one to the far left was like. "Hey man, I got something on my face, can you see what it is?" and the middle one said "Sure man, let me see that. Hey Bob, can you check my hair, I feel like something crawled inside of it." and Bob said "Certainly, let me go see that."
Now if we saw their genitalia in the act of sexual activity, that would be different. But the image itself on suggests the act of sexual behavior and that's exactly what "Suggestive" indicates.