Fun is subjective.
I can't stand cooking for myself or my wife and I. It's the most boring thing I've ever done - I'd literally rather stand facing a blank white wall for an hour than cook. I'll go to great lengths to avoid cooking, and when I was single I just never did, unless I was so broke there was no other option (and I'd go without food for a couple of days before it got to that point)
However, I will cook for my son (about a year and a half old), because he really needs all the good fresh food I can provide him, and his diet is (partly) my responsibility. Somehow I exercise much more care and patience cooking for him than I ever have for myself. I still don't enjoy it but I tolerate it for him in much the same way as I tolerate changing nappies - it needs doing so it just gets done.
Thankfully my wife is an absolute wizard in the kitchen so I don't have to cook often!