Sir, my english is not very good hope you understand my feeling. I am 21 years old boy I was masturbating since 6 years now problem is when I am doing sex with my girlfriend my penis not going hard fully its half hard only not fully first time but now I again try with my gf second time byt still same problem penis not hard full in home when I see porn or else penis hard full bt when I am doing sex with my gf penis not going hard full I am still virgin I was try 2 times with my gf bt penis not going hard fully can you tell me please whts the problem. This problem is only comes when I was withvmy gf otherwise everything fine can you tell me please is this problem or due to Anxiety please give me some tips sir thanks.