Yes, most couples, if together long enough, have dry spells. But I'm still not convinced that it's unavoidable. Sometimes guys gotta up the romance when they start to feel comfortable and begin slacking in the relationship.
Same goes for girls, too. Don't jump all over my shit. But usually the female is more quick to feel unappreciated or taken for granted.
...well i consider a dry spell 2-3 days haha