Seriously, that's something none of us guys would have thought of.
Baby oil, or some other combinations of oils might do instead of lather...:shrug:
as for actually trying this or shaving my own nethers... sorry, no experience there.
Viola, if you are serious, tell me when you expect your razor, maybe we can arrange to get you a couple of PIF razors in different sizes, so you can tell us if size really does matter.:D