There really is no room in the male coupling for fluid to collect, for the most part most of it stays in the female coupling, the pressure releases through the threads which it was designed to do. For the most part there should not be that much fluid released - a table spoon or two, though I have had a few that surprisingly spray a large amount after a hot day in the sun. Always wear goggles!
Also, you really never need to connect the tool to the tractor hydraulics, just the implement side hydraulic hoses. Normally one side/hose pressure release will do the trick, but not always, sometimes you need to depressurize both hoses, that is the main advantage to have both mail and female tools.
I use the tool on a weekly basis, and it saves a huge hassle overall for connecting my grapple. Once you have it you can't live without it. My goal was to build the highest quality tool, so it should last a long time in your tractor toolbox.