True or false light

Maybe I grew,

Maybe you knew
I was no rougher
Than a few others.
 

Lots of exercises
Improve sex life.
This is why I'm numb
In my pinky and thumb.

Maybe there's a limit
To all that speeds.
We're all imperfect fits
To the reality of needs.
 
When it's over
I'm led to discover
What use is all this,
Why I have to resist.