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Well, I don't know what sex has to do with it, but of those, the Dragonfly seems best suited to your requirements. If it's in your budget (100 NZD is about 60 USD, so probably not), get one in ZDP-189 steel.
The Dragonfly is large enough to be useful for most everyday carry (EDC) tasks, but small enough that it should be as legal as one can be carrying a knife in NZ, and the least likely to scare people when he uses it. A cursory glance of NZ knife law tells me that your country has a UK-style "unlawful, but it is a defence to prosecution that ..." statute that says that if it comes up, you need to explain to the police why you need that specific item for that specific task, and it's up to their judgment (or, if you choose to fight it, the court's) about whether it's confiscated and/or you're prosecuted. In other words, while you're permitted to bring a knife with you to a picnic, if they decide that your scary-looking, all-black folder is inappropriate for the task of slicing apples, you're in trouble.
The Leek and Flash are far more likely to get him into trouble, given that they both "flick" open; the Endura and Buck 110 are both fantastic knives, but too large to carry in that environment. For that matter, the Dragonfly can be opened with one hand and locks open, so even that could be problematic. If you want to avoid the hassle, it may be better to buy him a Swiss Army Knife.
This is equivalent to going on a car or gun forum and asking what kind of cars/guns do men like. We all have different preferences. If he is not a knife person a multi-tool type of knife like a swiss army knife or leatherman will get a lot of use over most. My recommendation would probably be for a Victorinox Compact as it has a lot of useful tools to help in normal day to day life. But you really can't go wrong with a Victoninox, Wenger, or Leatherman when it comes to multi-tools, just pick one based on his need.
From your list I can tell you they are all good knives you picked out but I would avoid the Buck 110 if your not sure if they would carry a knife as it's quite big and heavy and definitely requires the sheath. The larger size of the Flash II and Edura may be a bit of an annoyance to someone who didn't have a interest in carrying a knife before as well. The Dragonfly and Leek will probably remain unnoticed while carrying it till he needs it and would be my picks based on your 5.
I'd go for the spyderco dragonfly in g10... That thing is quality, super good looking, and small enough to keep on him at all times. I'm not sure, but I think the ZDP blades only come with FRN scales. I'd forgo the the ZDP in favor of the G10 scales because it's such a small knife and the VG-10 steel (on the green g10 version) is pretty good too.
How about a gift certificate from a merchant dealing only in knives? That way he couldn't buy anything but a knife and you'll know he likes it because he picked it out himself.
No, none of those are G10. The G10 handles are sort of a gray-green and have a texture that looks something like cloth.Hey thanks for your comment, I've looked through our local site and is a little confused. Are any of those ones the G10 scales?
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What if he buys something stupid and she dumps him for being tasteless?How about a gift certificate from a merchant dealing only in knives? That way he couldn't buy anything but a knife and you'll know he likes it because he picked it out himself.
The three-four layer 91mm SAKs like the Climber, Explorer, Yeoman, Trail Guide, Huntsman, and Compact are all phenomenal.That could be an option. Maybe I could get him a cheaper SAK that would be useful for everyday and a 100 dollar voucher for him to decide what he wants.
How about a gift certificate from a merchant dealing only in knives? That way he couldn't buy anything but a knife and you'll know he likes it because he picked it out himself.
The ZDP-189 sells for $155NZD compared to the normal version which is $115 still doable hm is the difference worth $40?
Thanks for mentioning the law side of it, I guess he wouldn't have much luck carrying the bigger ones with him to uni...