I tried amazon to find out, but i really couldn't figure out what water saving tech would be most helpful. See the Water Saving Tap Aerator
I can't identify its gender
That looks like a female (internal) threaded tap. It takes a male (external) threaded insert.
I really couldn't figure out what water saving tech would be most helpful
If you unscrew the hex insert using an appropriate spanner/wrench you can check the thread size and order an appropriate insert.
Personally, I find not turning the tap fully on, and turning it off early are good water saving solutions. You could also fit a service valve under the basin or sink and turn that half off.