length first, than girth?

Does anyone know if it’s better to gain length first, and then go for girth. I read that if you try to gain both at the same time, you will not get any girth (since you’re stretching the penis and the tunica is stretched out instead of having blood pumped inside the tunica). It’s like a rubber band, if you stretch it enough, it gets skinnier. Anyone have any ideas on this rubber band theory?

Try doing a search on the “rubber band theory” if you dont find answers then I will explain it.