We bought some in Egypt. Very cheap, about £1/tablet. 100mg tablets. They also had Cialis, which is a different chemical with similar effects and a longer half-life, which means it's advertised as lasting 36 hours. They only sold that in bottles of 50, which seemed a bit much, so didn't buy it.
Anyway, we cut the 100mg Viagra in half, had one half each.
I'm 27 BTW, in the past have done it about five times without any Viagra, but not for quite a few years. Twice is no problem though.
You have a slight headache within a few minutes. It has a sort of 'should not operate heavy machinery or drive a car' effect to it.
Had similar effect on wife, we didn't think that much to it really. Slept quite poorly (and not just because of the shagging) - it gave us a bit of a headache. She was quite tired so it might not have been the best time to attempt an all-night sex marathon - we only did it twice I think. Perhaps worth another go though.
Definitely worth a try though. It says on the packet 'for erectile disfunction'. That's not true - it has a 'shag more times' effect too.
I think you can order it from Boots, etc. online, though you'd probably have to say you're a 60-year-old man who can't get it up, so not sure if that's recommended or not.
The pills are sold in 100mg, 50mg, or even 25mg sizes.
100mg is far too much unless you're a geriatric, 25mg might be worth a try. They all cost about the same, so just buy the 100mg. It's fairly easy to cut in half, though quartering is rather trickier. There may be devices to help with this.
Article on women taking Viagra here: www.guardian.co.uk/lifeandstyle/2007/mar/11/familyandrelationships3
Like I said, why not give it a try....