First reaction - Men whose "young adult" days were well back into the last century also want to open jars. If you're willing to use a tool or two, it's still easily done. Maybe the difference is that I got used to using tools, back when those were more-manly things like screwdrivers and socket wrenches?

Second reaction - If you want the food to be safe to eat, but without the extra cost and hassle of jars with separate home-canning-style lids and bands, then being hard to open may be pretty inescapable.

No one should be able to do anything. You learn to do it or you don't. There are women who are already capable of opening jars without help. There's no conspiracy here. If you think it's an untapped market go out and start selling easy open jars.