I think it's a good practice to make sure the woman is thoroughly pleased. Sometimes women don't orgasm during sex (though this is unlikely the case with your wife), so I think it's a really nice thing for guys to do for the girl they are with. And if she did climax during sex, all the better. My boyfriend and I usually only go for one round within a space of a couple hours, but sometimes he would tease me after we had sex. Usually I told him to stop, but once I let him keep going and we ended up having sex again. Sometimes guys can regenerate pretty quickly if you fool around after sex.