A really shocking E-mail I received!!

As-salaam Alaikum, my question sister is regarding Anal Sex. I know clearly that anal sex is forbidden in Islam. However my husband is not a well practicing Muslim in this regard. I try to practice Islam as closely as possible and try to remove things in my life that may be sinful. My Husband is overall an understanding person and does not create any obstacle in me trying to follow Islam. However, when it comes to Sexual issues, he does not like it at all when I put restrictions on him. He likes to have full freedom in this aspect. He really wants to do anal sex and I stop him but then he gets very upset and mad at me. Due to this he is even fading away his understanding for me in other areas of life. He is frustrated, and some times even if I don't like it, he has still performed anal sex with me forcefully causing me tremendous pain and discomfort. My question is, am I going to be punishable for this? In my heart, I know its wrong and I also try to stop him, but sometimes he just does not listen, will Allah hold me responsible for this? Am i sinful?I  do wish to divorce him over this issue. Sister as embarrassing as my situation sounds please post this on your wall so that young Muslim women out there know what they may encounter in marriage. The looks and appearance of a person is deceiving and only once you live with the person does all his true colours come out.In appearance, my husband wears the thobe (kurta) seven days a week, he prays five times a day and yet when it comes to sexual aspects of our relationship he is a devil. Part of the problem sister is the instant availability of sexual pornographic material on the television, computer and of course the mobile phone. I have been separated from him for a month now and moved in with my parents. However, a week ago I went home unexpectedly to bring the remainder of my clothes. I was shocked and disgusted to find him engaged in sexual intercourse with two other men (sodomy) and a white woman. I could not believe what I witnessed in front of me and felt like throwing up..I stormed out of the house only to receive a text that if you can not satisfy me through anal intercourse I will seek pleasure elsewhere.....There were a few times when he suggested that we participate in group sexual activities with a few other Muslim couples he knew who were engaging in these type of activities as well.I brushed off the idea.....He wears  thobe during the day and yet on weekends he frequents night clubs with his friends. He watches pornographic movies and always compared me to his favourite pornstar going as far as wanting me to go in for a breast augmentation surgery as well as buttock implants.....astaghfirullah.........

To my Muslim sisters out there who are single, marriage in today's day and age is really difficult. Think twice before deciding to marry. I now regret marrying and feel that I was better off leading a single life.What is happening within our Muslim communities in South Africa is shocking but no one is talking about it and bringing these issues out in the open.......I ask all of you to please make dua for me through this difficult time and to ask Allah to guide all those who are astray and who have gone against the teachings of the Quraan and the Sunnah of the Prophet Muhammed (saw).......Thank you sister Sumayya for being bold enough to stand up to issues that are affecting our communities and talking about it openly. The world needs more people like you. My duas and well wishes are always with you. May Allah always be with you......Ameen