How do I not let it get there?

I've made quite a few male friends in a short period of time.

I'm noticing that some are taking interest in me more and more (I noticed attraction before, but that doesn't have to mean anything).

I'm not romantically interested in any of them (meant nicely).

What do I do? I can't avoid them and I want to stay nice and fun, but I don't want to give them the wrong idea.