When I think of “mojo” I often think of a friend of mine who was stuck in a crappy relationship with little-to-no sex. Though her boyfriend wasn’t supplying the TLC she clearly deserved, she was a loyal girlfriend and wasn’t about the throw in the towel. She sought counsel from everyone—even her mom, with whom she is super-close. The situation escalated (or de-escalated, as it were) to the point where the mom sent her a care package that contained a poppy-red La Senza bra and a note that said, “To help spice things up.”

But my friend didn’t want to “spice things up.” While the bra was gorgeous—and yes, it is always ...