I am 23 year, weight 96kg, height 170cm, male. my pennis size is very small around 4cm after erection . i want to increse the size of it . i am also habit of maturbation frequently weekly 4-5 days, is it effect on size of pennis? Is there any way to increse the size of pennis...also i m thiking to use JAPANI oil.. Is it effective??