2752(a), or 2753(a)(1) after a prior sex offense conviction shall be twice the term of imprisonment otherwise provided by this chapter, unless section 3559(e) applies. (b) Definitions In this section— (1) the term prior sex offense conviction means a conviction for an offense— (A) under chapter 109A, chapter 110, chapter 117 or section 1591, 2751(a), 2752(a), 2753(a)(1)