Why Doesn't my boyfriend want to have sex with me anymore?

I feel like I had written this. I have been with my boyfriend a little over a year. He lost his virginity to me, and we used to have amazing sex like four-five times a week. I was always more sexually aggressive than he was but I'm also more experienced. After the first 5-6 months, it started steadily declining. Now we can go three weeks without it. I usually come onto him and do all the things I know he enjoys, and afterwards he says he's tired and goes to sleep. He hasn't bothered even touching me in quite a while. I'm also 90% sure he's not cheating, but 85% sure he's gay. I don't think I can stay with him at this rate.

i am after reading every single post on this topic.
im 20 years and my boyfriend 10 years older.we have been seeing eachother for 2years and living together.
Other than the lack of sex issue we connect on a multitude of so many levels.
For the fist 6months of the relationship my man couldn't get enough of me. I felt sexually desireable and beautiful. For the first time in my life i realised my self worth. My confidence soared and i indulged in exploring my sexual-side (something i never previously did) and loved this new adventure.
You see, before i met my boyfriend i had been sexually abused as a child. Sex was a difficult thing for me. I could not have intimacy with boyfriends and on the rare occassions that i did agree to sex, i wasnt emotionally engaged in it and was only waiting for it to end.
My boyfriend knows all this from basically the start. It never effected our sex life. He taught me that sex was about love and being comfortable with myself. i changed my attitude completely and revelled in our sex life.
Boy did things change.
For the past year he never initiates sex. ever.
I ask myself all the ime whats wrong with me, why he is hurting me like this. I am the one who always initiates sex,approx twice a week, im not sex crazed, i would think this is a normal amount per week to expect. He often turns me down, finds some excuse or pushes me away. I have tried to talk about this to him on different occassions. i asked him did my past bother him, he says not one bit.
I have tried everything. Dressing up in sexy underwear, trying to be seductive, not having sex for a while to see does he come running.... I always make sure i am clean and my hair is well managed. i manicure my nails and get a spray tan every week so he doesnt think i've let myself go.
I know i am not an ugly girl. i have a good body and im told im pretty. I get hit on every night when i go out with the girls so i know im not repulsive. You might say well if i have guys hitting on me when i go out clubbing why dont i just get with a guy and move on, but the only man i want is my boyfriend. i love him deeply, i would never be unfaithful.
Im sick of going to such shallow lenghts like watching my figure,tanning etc to get one bit of notice and i never do. im sick at myself for allowing him to hold my happiness in his hands by deciding when we're allowed to have sex. i feel rejected, hurt and ever plummeting confidence.
And also i know he still has a drive because he looks and porn to pleasure himself whenever he has a chance. he doesnt realise i know this.i got mad at him once ages ago for watching porn on my computer and got accused of being a snoop and a freak for beingupset because ''all men do it''.
Please please somebody give me a little advice becuase i feel like my spirit is breaking.

maybe his penis despises you now.

omg im going through the same exact thing and i have no idea what to do about it either we went strong and heavy at the beginning and now its like 1 or 2 times a week

i cant belive how manye women are in the some boat has me. i been with my boyfriend 2 years. sex was good the first year but now we dont have any. the only thing he want is a bj tht all. i ask him is there anything wrong with me but he always say no. i have tryed everything i can think off. al my friends and family thinks i should finish him but i love him becaues got everything in a man i wanted like loving,caring,make me happy and feel good

hey i'm so happy i'm not the only one out there in this position. i have been with my bf for 9months now we never really had lots of sex to start with maybe once a week which i was very happy with now its like once every 5-6 weeks and i feel like its forever on my mind.
we usually go to bed at different times because he likes going to bed late he would never cheat we are ususally always together i just dont know whats wrong i have talked to him about it but he gets embarrased and i get mad he has basically told me that he wont change i love him lots and hes the best bf ever hes not gay he seems normal i'm just starting to think that maybe i should break up with him because this is always going to be an issue for me.

Hi all, I haven't had a chance to read through all posts, but it's partly relieving to read about others who have the same problem I do. I'm no psychologist, but my housemate is. In the DSM-IV there is an actual disorder called Hypoactive Sexual Desire Disorder. It states that low sex drive is related to emotional distress, depressive disorders, weakness, pain, problems with body image, or concerns about survival. With the current economic climate, job stress could be a hugely contributing factor, and reason why this problem is becoming seemingly more apparent. It's even been addressed on local radio! I guess all I'm trying to offer is reasons to understand your partner.