First of all, make sure your expectations are normal. There's a wide gap between "trimming it up a bit" and "manscaping." That gap includes such gems as "topiary balls" and "his happy trail spells your name in cursive." If you care for him, do not push your man into that gap.
But yeah, no one wants pubes in their mouth. If you go to the effort to keep your genitals at a state of optimum enjoyability for your partner, there's no reason not to expect the same courtesy.
Not all guys are down for the full-on scorched earth smoothballs look, but I think the majority can get used to a respectable crew cut, or at least snipping off the rogue hairs. As for a nice way to ask him, that's easy: simply say that you think you'd give him so many more blowjobs if it weren't quite so hairy down there.
This time-tested statement has the immediate effects of nurturing intimacy, encouraging thoughtful communication of needs, and causing him to log onto the bodygroom website posthaste. And if that fails, there's always the old "leave a scrote-razor in his stocking this Christmas" routine.
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