<s>[INST] Hi i m 24 years male..  Earlier i use to master boost. But 2 yrs back I was in relation with a girl. I had done 2 times. Before doing this My penis use to get hard even when i think of a girl . But after that it is not getting harder even on thinking. Is it a problem or what [/INST] Hello dear,First, do not get influenced by any over the counter medication which claim to increase the size of penis or improve performance...it may be harmful. Though medications like Calls & Viagra increase blood flow to penis & maintains erection, it can be improved by having a diet rich in fruits, vegetables, fish, nuts & honey. Avoid stress...practice meditation.this helps in improving concentration & builds up the confidence level. Avoid smoking & alcohol. You can also do oil massage of the penis...it increases blood flow & maintains the erection. Wishing you a Healthy Life. Take care. </s>