I am so sorry if this is inappropriate but when I read the title of this forum I had to click it because the voice in my head was Dr.Who (for any that don't know, he has an English accent(I think??)) and to the flow of "I am not amused". I giggled.

But otherwise I think Viagra just makes you functional, but don't quote me on this. Its something you might want to ask your doctor or a pharmacist about.

But more importantly have you tried asking yourself why you're not aroused by your girl friend? Because being aroused is more than just getting it up, its an emotion, a desire to be close to her ect.