Alive - feeling the fresh vigor of existence and the freedom to do as you please... perform as you wish to anyone and everyone.  The heart beating and with both lungs pumping air, allowing red blood cells to deliver oxygen, for vital functions to work as they do as they do as they do...

The internal workings of you !!!

Consider the complexity of procreation- the female body generating another.
Or puberty, with the body physically changing, like Aging.
Getting old, it's no fun to feel the wear 'n' tear of the environment.
I'm glad I'm relatively young, compared to my older relatives.
Ha!! but Unfortunately we are all nearing death. dun dun dun
Heaven awaits me, for I only live with respect for God.
Like everyone should- be thankful to be here, wherever you are,
maybe having sex, making Love, or otherwise masturbating...
That's good too tho, I won't knock that, for sure !!