L.M.
It's hard to know what the right thing to say and do are in this situation. I have a 6 year old who has already fallen "in love" with boys and have even announced she will marry certain boys. I know when I was her age, I didn't think boys were gross, I liked them, but I wasn't as aggressive about it.
I have had to sit down both of my children (I also have an 11 year old boy) and explain the difference between love and having a crush. I have also explained how special and important each of these emotions are. I have also explained that physical actions, such as kissing, should be saved for when they are older and more responsible for their actions. And that even kissing someone is very important and shouldn't be given out just because they have a crush on someone. I explained that mommy and daddy kiss because we LOVE each other, are adults, and are married to each other.
I have noticed on some of the kid shows out there show quite a bit of kissing. I was watching one show just last night and a boy and a girl kissed. The boy couldn't be older than 12 (the girl looked a little older)! My mouth dropped. It was one of those drawn out kisses, not even the more innocent one second peck. I turned to my kids and made the comment that they were much too young to be kissing anyone in that manner and that it made me uncomfortable to watch. I told them the show was trying to make these kids look more like adults when they are really only children.
I think the best thing is to be honest with your child no matter how uncomfortable it may make you. It is surprising how much these young kids know and how much they are exposed to. Good luck!