First, If you love (or hate) the band KISS or Paul's talking between songs you have to check out this clip on youtube. It's a tribute band called the Paul Stanleys. It's hilarious!! The scene ordering at McDonald's is outstanding.
Second, Some dimbulb marketing for Wendy's Hamburgers thought it would be nifty-neato to attach The Violent Femmes' "Blister In The Sun" to their new chili and potato campaign. The song's about masturbation. Why not just inject "I Touch Myself" by the Divinyls or "She Bop" by Cyndi Lauper?
Of course, that was the original intended meaning. But there are a lot of songs that individual listeners interpret in their own ways. Maybe Wendy's licensed it because it, uh, has a... good beat?