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?