I've been in a very happy, albeit sexless for the most part, marriage for 3 years now. In the past 12 months we've had sex twice. granted she was pregnant for 9 of those 12 months and it took several months afterwards for her to even think about it, but its been a long drought.
When we decided to try and have a kid I was very excited! regular sex at last; before that it was usually once a week or less. I get morning wood and she isn't interested and in the evening I'm whupped after a workout or a hard day at work and she might be feeling frisky. It rarely seemed to gel.
Anyway we decide to try for kids and hey presto, first time without the rubber I knock her up. One and done. She was so paranoid about hurting the baby that we had sex maybe once or twice in the first couple of months and then I was cut off. For 4 months after the baby was born I was cut off too...which was hard because for the first time ever she had big boobs.
Before we got married we had sex every night. If I was over at her place we did it, if she came to mine we did it...as soon as we were on neutral ground, in our shared abode, it stopped. The bedroom was no longer a place for sex it was a place to sleep. Not only did the sex dry up but the spice too. The last BJ was on honeymoon and these days its plain old missionary and nothing else.
To be fair its half my fault, my drive has waned too. 10 years ago I was up for it 3 times a day. I'd see a commercial on TV with a hot chick and I'd have to go beat it. Now at 40, I'm just not that interested.
Still very happily married and very happy I'm no longer in the dating game, taking psycho chics out to dinner and trying to bed them afterwards. I do not miss that nonsense one bit.