Can The Penis Size Be Increased?

hello..i am male 26 my penis size is small around4 inch ..i want to grow its size..n one more think i have one testies out of 2..one was taken out when i was 18 ..bcos it got damaged ..plz help how can i gain size n even how can i stay long during intersourse as i ejaculate within 5 min.how to increase time??