Speaking on behalf of my gender, the man in your life would love flowers or chocolates tomorrow. But since we have our gender roles to play (and this is a tech site), any one of my Products of the Year or one of these male-appropriate gadgets would make great "I love you" Valentine's Day gifts.
Not that you're making a commentary on your man's grooming habits, but if he's got any facial hair he likely has both a razor and some sort of a trimmer. He can combine these into a single, small three-in-one Fusion ProGlide Styler from Gillette ($20). It's a five-blade (yeah, I know, how many blades do you need?) razor, a Braun-engineered power trimmer (you get three slim combs) and an edging blade – and it's waterproof and runs on two AA batteries. I've been manscapping with one for the last week and I find the ProGlide gives an incredibly smooth shave and let's me trim my beard in the shower – no more little hairs littering the sink.