An extended sex spree, or binge, involving a single partner.
You don’t go on a sex bender with your girl/boyfriend, you go on a sex bender with your EX girl/boyfriend, or any ex-flame of any sort. (This person must be someone you’ve ALREADY slept with.) SBs typically last three to four days, very rarely less, occasionally more, and MUST involve travel (usually, and preferably, by air) to a “far away” city; i.e., that place s/he moved after you broke up, or that place s/he STAYED after YOU left. SBs do NOT involve love, or intimations of love, nor do they involve guilt or intimations of guilt. Think “free pleasure zone”.