Are you married to him??? If not RUN!!! Run FAST!! I am in a situation like you except I married the man now. We had a whirlwind dating relationship and didn't have sex that often nor did we live together prior to our marriage because of our kids and other factors. We met in church so I felt he had to be a very nice christian guy.
Not long after we were married he lost his job as an engineer of 20 yrs. He sat home while I worked my job as a nurse 50 to 60 hrs a week and did nothing. He gained from 325 lbs to over 400 lbs when he promised me that right after we were married that he would have a gastric bypass. He already knew that his weight was making sex difficult for us. I would come home from being on my feet all day and he would be sitting naked in front on the computer in our bedroom on the internet watching internet porn, or chatting... who knows. I told him right away that I did not like it. It was at that point that I started to get turned off by him because he turned from the christian man I viewed him to be to a sexual addict. He started doing exactly what your man does ... talking about sex all the time. Every word that comes out of his mouth is about sex. Even in front of my 78 yr old mother who lives with me. His son who is now 12 views him as a pervert (thats what he called him when we were visiting this past weekend)
Its three years later ... nothing has changed except that I try to do my duty to keep him happy to keep him from going out and going somewhere else. The weird thing about my hubby is that if I make love to him frequently, he's not happy... he wants more oral and if I add oral .. he wants anal... I can't keep him happy. I find anal sex disgusting... and oral sex is something I use to love when I was with someone who didn't ask for it AND with someone who could at least keep themselves clean down there. ugggg... I am sorry.. I know he's my husband but the smell of sweaty balls makes me want to yakk!!! So, I started bringing a warm soapy washrag to bed and including a bath into our love making. Romantic huh??? Anyway, I never have in 3 yrs been able to make myself be turned on by him. Unfortunatly, I have became very ill from stress and my MS and Fibromyalgia has gotten very severe. I started having seizures and have been in a coma once this year. My doctors told me if I don't get the stress out of my life I will die. This is a nurse that was working 50 hrs a week 3 yrs ago who has gone to someone who is no longer able to drive a car, work a job, or remember to take her own meds due to brain damage from frequet seizures. Please... I am warning you... STRESS will kill you, don't let it get to you. I am only a shell of the person I use to be and I am only 43 yrs old.
Best of luck to you and what you decide. On the bright side for me... I am working a home business that I use to have when I was single mom on Ebay and building that up. I am going to start couselling after the first of the year with or without my husband.
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(¸.·´ (¸.·' ¤ Nina