According to the CDC; about 90 percent of men and women have had oral sex at some point in their lives‚ but that doesn't mean they continue to have it regularly, or even that they liked it in the first place. The reasons why some folks aren't up on going down are a Freudian analyst's wet dream: People fear it's unhygienic. Or they dislike the taste. Or they worry their technique is bad. Or they simply find the idea of faces being in places swimsuits cover to be generally unpleasant.