((a)) ** .—** The maximum term of imprisonment for a violation of this chapter after a prior sex offense conviction shall be 3 times the term of imprisonment otherwise provided by this chapter, unless section 3559(e) applies.

((b)) ** .—** In this section—

((1)) the term “prior sex offense conviction” means a conviction for an offense—

((A)) under this chapter, chapter 109A, chapter 110, or section 1591; or

((B)) under State law or the Uniform Code of Military Justice for an offense consisting of conduct that would have been an offense under a chapter referred to in subparagraph (A) if the conduct had occurred within the special maritime and territorial jurisdiction of the United States; and

((2)) the term “State” means a State of the United States, the District of Columbia, and any commonwealth, territory, or possession of the United States.