Marketing: XM vs Sirius

OK, OK... so I've had a slow day at work and I've been sucked into watching the stocks again. I had a thought on the way home last night that I'd forgotten about until now, as I watch all the speculation of the most minute and mundane "details" up for consideration in a stock's worthiness. Anyway, might "XM" itself bring about neagative connotations when people are trying to decide whether to get XM or Sirius. X is associated with X or XXX rated films and all that juicy (pun intended) stuff. Meanwhile, Sirius depicts a dog with a star for an eye. Maybe I'm just bored.