I examine them daily practically, either while bathing or during masturbation, I have a pair of large low-hangers, inherited them from dad ... best time to do it is in the shower, or right after one, when they are nice and warm and low-hanging and you can really feel each testicle individually ... and yes, there are all kinds of tubes and veins and the like down there too, which are supposed to be there, get familiar with your anatomy, and you wont panic when you feel these various things for the first time ... furthermore, and I dont think anyone has posted this topic as yet, some guys, myself included, have varicose veins of the testicles too, in some guys its very pronounced and painful and has to eventually be operated on, in others, like myself, I only feel it when I have been on my feet alot ... its been given the slang-name "sack-of-noodles", as that is exactly what you feel in your sack, to varying degrees, and more than just the normal tubing that is always present down there ... comes from alot of heavy-lifting, especially at a younger age, or with jobs that entail alot of heavy-lifting, which in my case is the truth, as my first real job back in my late teens was hauling packages for UPS in their processing center, and there was tons of heavy lifting involved with that.