I am pro-sex; let me be clear about that. Sex is a good thing, or at least is can be. I also don't have a problem with using sex and sexual innuendo to sell products. For me the issue is not whether you use sex in advertising, but how.
Take for, for example, this Singaporean Burger King ad (source). Comparing a seven inch sandwich to male genitalia is overly obvious and not terribly clever, but, whatever. What make me more uncomfortable is the heavily made up and photoshopped women looking rather like a doll, a frightened doll. That's just, um, not nice.
Or is she just meant to look... surprised?
Blowing A Seven Inch…Sandwich