I’ve just had a glance over the acts that have had a number 1 in the uk, and there’s really very little get offended about. 10cc was mentioned above, I think.
The most obvious contender, and the only one that you could even consider getting offended about, really, would be LMFAO, because of the implied ‘fucking’ in the title. Weak sauce, though, it’s no Kunt and the Gang.