google, always looking for ways to sell you what they think you want.
someday you'll be "thinking" about sex and before you know it you'll have 30 ads lined up from craigslist's "erotic services" section. i suppose links to porn sites will be an option.
naturally any google instant messenger will automatically have ads based on current discussions.
its not about doing "good", but avoiding doing the "known bads" ... aka cover your a**.