Hi John, Welcome to health care magic, As per your facts that you have posted here,it appears that you have problem of getting hard erection while attempting to have sex and also green coloured semen while masturbation. This is kind of problems are often due psychological or mind related or may be due to performance anxiety. Below listed measures will help you to boost up your confidence and getting good erection and have enjoyable sex. 1) Do regular exercises for about 30 minutes followed by meditation for 1/2 an hour in the morning. 2) Take high protein diet rich in vegetables and fruits and Vitamin A,C,D,E.and Zinc 3)Take anti oxidants like Almonds 5-6 everyday.. 4) Avoid alcohol and smoking.. In addition to above,you will also need to rule out certain medical causes, like diabetes, hormonal problems, blood flow problems, vitamin deficiencies, etc.) I think you need to consult sexologist and psychitrics to get your pronblem diagnosed first. Thanks and Regards,