Lately I have not wanted sex w/my husband. Maybe its a mental block. we have been going through some issues. I have also gained weight. He needs to be able to talk to someone. I cant explain to him why I don't want it. I can hardly explain it to myself. When we start to get intimate I start to withdraw in my head. Its a lot easier to avoid it all together. I'm seeking help. You need to let him know, as I was let known that a relationship without intimacy isn't a good or secure relationship but asking for help isn't a sign of weakness.