Saddlebacking: sad•dle•back•ing \ˈsa-dəl-ˈba-kiŋ\ vb [fr. Saddleback Church] (2009): the phenomenon of Christian teens engaging in unprotected anal sex in order to preserve their virginities
After attending the Purity Ball, Heather and Bill saddlebacked all night because she’s saving herself for marriage.
I think that’s just as good as Santorum:
Santorum (san-TOR-um) n. The frothy mixture of lube and fecal matter that is sometimes the result of anal sex.