Why is it that my boyfriend is not sexual with me for the past month, almost?

The only place to get the real answer is from him but I would suggest the approach you use when asking him be one of concern rather than anger. Just because you have a boyfriend doesn't guarantee you'll have what you consider regular sex. Besides, he may be having problems too. You two both need to talk and listen-- it is the only way to solve this to mutual satisfaction.

I agree that you really need to ask him that. I don't know any guy that could willingly give up sex, wihtout being asked or told to.

Best person to ask is HIM!
As Valinors sorrow said, ask him in the right approach and also do show him that it is upsetting you as you are questioning it!

You may also want to see if any of his other behavior has changed. Is he less attentive to you? Are other areas of your relationship unsatisfactory? Have his sleeping habits changed? Is there a new activity in his life, or extra time at work? He may just be tired, or he may have a medical problem (like depression) or it may be any number of things.

You haven't stated your ages... but if you are both young, it may be that he is trying to slow the relationship down to minimize the risk of pregnancy. You also haven't stated how long you have been dating, which could also factor into the answer.

The advice above is the best... you need to talk to HIM about it. Try to do so with concern, that you're worried about HIM, rather than attacking him and blaming him for not having sex with you. It may have nothing to do with you at all!

Have you noticed any other change besides him not being sexually attactive to you?