Shepard is of course referring to the OSHA compliant high traction coating applied to
Miranda's crotch the floor.
Miranda's backup plan was to throw a tantrum and threaten to "not be loyal any more".
Mass Effect Comic 'Worn Down and Dirty'
Miranda: I've cleared the engine room, Shepard. I'll see you there in 5 minutes
Shepard: Miranda, I've been shot at least a dozen times today. I think my body might be 50% medigel. Do you really think I want to roll around on some greasy jagget metal floor just to have PG-13 "sex" with you?
Miranda: Um... Yes?
Shepard: Argh! It's like sandpaper!