Erm, that appears to be the case, according to the latest issue of Her World magazine (not mine, obviously). And no, it's got nothing to do with sex.
But rather, we secretly buy stuff w/o letting our spouses know. One fella even bought a sports car without letting his wife know about it.
So DOES YOUR WIFE KNOW THAT YOU JUST BOUGHT THAT NEW 300mm f/2.8, hmmmm...???