A safe haven which could be limited to a closet, toilet, single room or a complete house were a male organism is able to produce semen by hand without being disturbed.
I used a wank sock everytime I masturbate so I don't have to worry about semen going anywhere else but inside the sock which saves me time that I use to spend cleaning semen off my keyboard, mouse, floor, etc...
A pair of trousers (usually an old pair of jogging bottoms with an elastic waistband) in which a male can comfortably masturbate whilst wearing, thus creating warmth on a cold night without the need for a duvet or blanket.