I believe that sex has it's own place in fanfiction, even in kid-related franchises like LBT. In fact, you can find such stories in stuff like Dora, Care Bears, even Barney has a few. However, if a story isn't well made, it hardly interests me.
When it comes to sex scenes I expect a level of maturity from the creator when handling such scenes. This not only means making the scene itself well-written, any immature writer can do that. This is a different level of professionalism that must be understood to the fullest. It's kind of hard to explain really. (Okay, it's not, but what I would say I choose not to reveal since this is a public board and children could be reading this.)
That being said, I would like to take a look at this story of yours, karkovice. If I end up liking it, and I feel it has maturity, I can reveal to you personally a few places you can post it if you wish me to. Just know, some of them expect the same level of maturity that I do with such a fanfiction. So don't take this offer lightly.
With that being said, please send the fanfiction to pokeplayer984@gmail.com
Remember, I will be taking it seriously.
For now, I await the fanfiction.
