Exercise to treat premature ejaculation

Q: I wanted to know if it was permissible to do some penis exercises with vacuum cupping therapy (dry cupping) with olive oil which helps solve premature ejaculation and erectile dysfunction.

I am unmarried and afraid that because of my teenage mistakes it will hamper my future martial life. I gave up all the wrongs which I did in my past and I do all my Islamic responsibillities. Will it be permissible for me to do the excercise on my own because I am unmarried. The exercise is to train the muscle related to that area for treatment purpose only.

Advising people to refrain from committing haraam

Q: Am I sinful if I see a family or friend saying or doing something haraam and I don't denounce it. Ever since I found this out, I have been telling people so politely but now I keep spotting things and because I keep denouncing things, I lost so many friends in the past as they find me annoying and it makes my life miserable. Is denouncing a sin in my heart efficient or am I sinful if I don't say anything?

Benefits from a bank

Q: Is it haraam or sood/interest to receive free Telenor minutes and MBs by keeping more than one thousand rupees in Telenor Easypisa account and doing at least one transaction from the Easypisa app account in a month? Telenor gives 50 net minutes and internet MBs to such customers.