Of course it really happens, to me that is. How long has this been going on, if I may ask? If it's been a really long time, say months, then perhaps it's cause for worry. But I'm sure every subbie has their week, or even a few of em. Some doms do too, I believe. And if he truly is a subbie at heart, rest assured that it will come back, if you allow it to do so naturally.