The answer would be pubic hair. Because, secondary sexual characteristics.
Visible secondary sex characteristics are nonreporductive sexual characteristics.
For males things that will start to show are pubic hair, facial hair, and Adam's apple.
Spend some time to yourself, enjoy your favorite tv show while eating your favorite food, hang out with people who make you feel good about yourself, get a nice massage ever now and then
Viral, bacterial, fungal, communicable? I know three not sure on the fourth one sorry
I believe the answers to this is semen and saliva i think.
The cells eventually start to die out, causing for organs to slowly dye, starting with the lungs and heart which is why you may feel cold as the blood thats pumped stops...I hope your depressed now...Naw just kidding health is important to know :)