I am 79, male. I have an enlarged prostate. Otherwise I am healthy, normal weight, low blood pressure, exercise a lot. I maintain normal testosterone level by regular injection. I can get erections but, before orgasm my penis softens. I am not able to get to orgasm without real vigorous stimulation. My partner is unable to get me to orgasm by oral sex. I do Kegel exercises regularly. Please help me have orgasms during intercourse. This is very disturbing to me. Thanks for any guidance.