Thanks for query,
is not harmful if it is done in one period or many.
The resting condition penis deviation towards left is not an abnormal thing. so nothing to worry.
You ca not save anything by any practice of pressing.
Masturbation does not affect your fertility
It is a physiological need of male it will not harm you. but any excess is poison so control yourself being too much involved in one act.
Do some yoga
to divert your mind .