I've played CF as a single man. Fine, do whatever you want. The nagging thought that I could probably find more productive uses of my time is pretty easily shut down if CF provides even a tiny bit of fun. No different than playing any other VG, reading a book or watching TV
I've played CF while dating. Pretty similar to the above, as girlfriends will be more acceptant of things, and you're probably not really playing CF when you're around her, because the theory is you're not always around her.
I've played CF while married. Now she's always around, so it's an ever present reminder that there are other things besides CF. Throw in that the wife does not like it when she can walk in and say something to you and you completely ignore her because you're immersed in the game. It's not so much that you play CF, as it is that when you do you sort of disappear into it. CF is still playable, but you have to balance it out against the other things, and most women can only stand being ignored (cause that's usually how they see it) for so long before they start bitching about it. The hobby argument fails, because it's not constructive in their eyes. In essence, there is now a definite cost to playing CF, which means you really better be enjoying the log-ins, because more often then not you're going to pay for it in some fashion later on.
I've played while married and have a child. It's really just hard to justify playing and forcing her to deal with a screaming child cause "I'm in the middle of a raid". Also, the amount of time I have generally available just became so much less, and in far smaller blocks of time, that playing Cf becomes difficult. Having occasional 15-30 minute log ins just makes it hard to get into CF.
Being in 4, I just find CF doesn't give enough of a return. It's easier for me to play games that have quicker turn around, or instant save/quit features. Honestly, you get tired of explaining to people you just fought, or are fighting, that you have "otherworldly matters which urgently beckon you away." I remember Tontik/Marintok talking about harpies screeching, and that he was a member of the bucket brigade (so I'm pretty sure he was a RL fireman) and so may have to disappear without warning.
The last char I played, half of my log-ins were under ten minutes because my daughter who I thought was asleep started screaming as soon as I got to my cabal to ask who held our item. I managed to play for maybe a few months before I just couldn't do it anymore, and I haven't played since. Granted, the environment didn't instill a great desire for me to try and play either, but when you compound that with family obligations, CF becomes a very easy thing to cut from your life.