The Day I Found Out What "Lemon" Means

I was looking for some NaruHina fanfiction, and I came to this site, and there were two catagories. They were "Mature Readers", and "Lemon". I thought,
If "Mature Readers", isn't safe to read, maybe "Lemon" means like, "Clean", of something.

Lemon does NOT mean clean. I was shocked, and responded with, "Holy CRAP! THAT'S SOME ****ED UP ****!"
Still being confused, I tried Wikipedia, (a true gift of wisdom!) and looked up, "fanfiction lemon". Apparently, Lemon means a fanfiction that contains strong sexual content. Thankfully, this site only allows PG-13 fanfiction. I may be a mature reader, but I'm not ready to hear about NaruHina's "alone time", because that's just not right.
A) Because it has too much information
B) It's messed up
C) YOU PERVERTS ARE WAY TO GRAPHIC! SERIOUSLY!

And so, I will never read ANYTHING that has the word "lemon" in the description.