I am not into sex that much right now and all he wants is to talk about it and wants me to do it. What do I do?

Ask him if he wants to be a daddy. Sex = babies, even with birth control.

Just be straight forward and say "No". If he does not respect or listen to that then I suggest you sit down and consider whether he is the man you want to be with.
I know sometimes saying no is not that easy, I struggle with it but that is the simplest method.
You should not feel pressured into having sex, your body your decision

Tell him to chill, that you are not ready and if he can't deal with that to leave you alone.
If he wants you and not just sex, he should respect your wishes.

Ok first ask him exactly why does he want to have sex so bad and if you guys do it what does it prove that you guys love each other no because the love is suppose to be their regardless and if he has no response leave it at that but if he does just question him until you feel he gives you a legit answer that's the advice I gave 2 my friends and their relationship still going strong with out sex :)

He used to talk about it all the time and it was bothering me should I dump him for t?

That is a decision only you can make. It is your life and you have to live with the results of your decision. Have you talked to him about what you are feeling and how it bothers him? Does he respect you? Make a list of pros and cons and see what that tells you and go from there.

If you are just looking for a reason to dumb him that suggest you don't want to be with him
If you don't, leave him

Men like sex. Proven fact that they think about it almost 9/10ths of their thoughts. However, being honest is the best thing that you can do. If he can't appreciate your honesty, your not ready for each other.

How Often Do Men Think of Sex in a Day?

Please keep this in mind. He's human after all.

He's your boyfriend. Tell him, just like you told us.

I know. I have the same problem. Sometimes, your probably thinking "this guy means the world to me, but i think he justs wants sex, not me" yep. Been there. Done that. Just tell him. Be like, look, I don't want to talk about this. Can we change the subject, because to be honest we only live once and really there is better things to talk about. For instance, goals, what your going to do in the future. Stuff like that. You can't hide something from him. Let your emotions out. Just be straight up honest with him.
Hope this helped you

This is from 2011 and the OP hasn't been back - I'm sure she's figured it out by now.