I love G..
Every time I take G, when I go to the bathroom, I notice my penis is...well..about half way hard (no matter if i'm thinking about sex or not). I also notice when I am in a cold room, or I am on some type of speed, and I take G, it definitely helps "get it up".
Also I do tend to think about sex while on it (if i'm walking around somewhere, I will be looking at girls more often than normal, saying to myself "ooohh yeah"). Girls look more sexy than they normally would.
Viagra sucks.., my vision will have a blue tint to it (normal side effect), but I am not any more horny/more interested in sex, and I orgasm way too fast.
GHB rocks!!!