doesn't work for everyone unfortunately. It's really complex down there in terms of what causes what... all kinds of enzymes and shit floating around. Viagra for example works by inhibiting an enzyme which makes you LOSE your erection. Plus there are a bunch of psychological effects, physical effects: weather effects, temperature effects, friction effects.
I guess everyone's just gotta find what works for them, but to ask the GF to hang in there while we figure it out is what makes it tough... (i was gonna say 'makes it hard', but we all know how that works).
2 to 3 minutes (what a crazy doctor!). Now I know why dancers expect you to consummate in 1 song. I keep telling them we are MEN not machines. It's hard to get everything done under the pressure of the 1 song clock ticking away. Women just don't understand.