When my wife and I finally decided to divorce, we tried for it to be amicable. It wasn't that there was abuse, drinking or anything like that; we had just clearly fallen out of love. OK, maybe her more so than me.
Over the years our sex life dwindled. She blamed it on decreased libido, but I knew the truth. She would rather have the interpersonal relationship with her "Battery Operated Boyfriend" than me. We used to have a great sex life - oral all the time, several times a week, etc. After the birth of our third kid it changed drastically. I tried everything: More foreplay, more dinners out, dirty talk, kinky stuff - nothing worked. Actually, the more I tried, the worse it got. I missed watching her face light up as she orgasmed and even considered planting a secret recorder in the room just so I could watch her masturbate.
I know what you are thinking; I must have gotten fat and unattractive to her. It couldn't be further from the truth. While I was 15 lbs heavier than when we married, she was a full 50 or 60 lbs. heavier, and she is nearly a foot shorter. She always had large breasts, but with the gain in weight and the babies, they sagged quite a bit. Still, that didn't bother me. I would love watching her tits bounce up and down when she came. She just wasn't interested in me. I tried climbing in the shower with her once. That was met rather rudely and she locked the door from then on.
Knowing that she used her toys quite a bit, I even tried to incorporate them into the activity. I tried dirty talk with her while she masturbated with a large dildo and a small vibrator. I talked about taking her to a swing club and watching her get fucked. Rarely did she talk dirty back with me; she just laid there with her eyes closed. She said she hated me watching because she felt like she was "on display." Sometimes she would suck my dick while she did it, but the pattern got to be that she would use the vibrator until she came (or was bored) and then I would hop on. One time, she got into the fantasy play and actually said, "Sloppy seconds" while I was fucking her, but that was rare. In truth, as things got bad, she told me about how disgusted she was listening to me talking about her fucking another man. She complained about how I only did that for my benefit. She had a point, but my benefit was I wanted her to be engaged in the sexual activity and not just lay there. I wanted our love life to return to where it was when we first got married and not what it was now. In the end, we decided on a divorce - her more so than me - and I lived with her while we transferred the home loan into her name so that I could get my own mortgage.
The process to do all of that took a few months. In the meantime, I stayed in the bedroom and she slept in the living room. She even moved a dresser down there. Still, every once in a while I noticed that her nightstand was moved and her toys were used. Here I was not getting what I wanted (sex with my wife) and she was still getting the sex she wanted with her "BOB." It was tough living there those few months, hoping that one day she might crawl into bed with me or join me in the shower. I even caught her off guard one day and asked, "Got time for a quickie?" She responded the way she had the previous 5 years in our marriage, "Not now, I am busy."
The end of the third month of living in separate rooms brought about a few things. First, I had found a house and we were ready to separate. Second, we had met with an attorney about our dissolution and all the financial terms came together. We just had a date set for 6 weeks out. What it also meant, though, was that I was still going to be in our house when my birthday came around. This saddened me because she used to give me great birthday sex: Outfits I liked, etc. Hell, even the previous year when things were really bad she gave me a great blowjob - though sadly she called it my "birthday blowjob." So, as my birthday approached I knew things were not going to be good and I only dropped one slight hint saying, "Hey, we will still be married and living together on my birthday."
The morning of my birthday was just like every morning the previous 3 months. I helped the kids get off to school, made my breakfast and headed out the door to work. That morning I got to work early and even considered masturbating in my office, but held off. I came home at the regular time, not expecting anything so much as a nice meal. I was actually surprised to find her car in the garage and her up in our bedroom. She was wearing a robe and was actually doing her makeup when I walked in. She didn't look up from the mirror, but she did say, "It is your birthday today, so I guess we have to do this one more time. The kids are at my mom's."