How do I stop being dirty-minded?

I've always been kind of easy-going about all things dirty so I get along well with guys compared to the other girls.

I've recently been kind of irked because my boyfriend keeps making sexual jokes with me. It makes me feel sort of slutty? We haven't done anything whatsoever. I just kind of want to be like the other girls and be easy going without the sexual innuedos.

I don't particularly mind them. But it kind of annoys me when I joke about it with my boyfriend. It feels weird and kind of un-relationship-y in my opinion.

In the back of my mind, I can picture him and the other guys talking to girls not in the same way as I talk to them.

What do I do to stop it? Do I even need to change this "part" of me?
How do I stop being dirty-minded?
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