I do discuss, though not all, but some of my online activities with my wife, most especially the ones that doesnt require me risking any money, and a good example of that is the FreeBitco lottery  .
I don't tell her anything about my actual gambling, but I one day did tell her that there is a platform where I pay weekly lotteries for free, and she was interested and can't wait for me to be among the winners some day, when ever it crosses her mind, she always ask me about my participation in the free online lottery, whether I've won, but I will answer her "no", that I am still trying my luck 

It's nothing serious actually, this is just one of the ways we get ourselves engaged in fun conversation from time to time, and this have made me eager, to want to one day, announce to her that I finally won, just wanna see how happy she would be