Coming up with imaginative Father’s Day gifts can be a drag: This year, get your dad something he will use. Groom Mate nose and ear hair trimmers ($19.98) work without batteries and are guaranteed to last a lifetime. Though we think of it more as a practical gift, the palm-sized device has been called “sexy.” And, it was one of the Top-3 gifts bought on Amazon.com last Christmas, outsold only by the iPod Touch and Nintendo Wii.