last night we (me and my gf) had sex for an hour or so , and than she suddenly went dry , can you girls explain me what can be the problem ? Thank you.
Tons of friction does that to me too, I'm still enjoying it I just toss some lube on it and it's all good.
Think of the moisture as being like the cistern on the toilet - after a flush it needs a little time to refill. Therefore, you either need to allow the 'tank' to refill, or use a lube, such as KY Jelly.
A woman going dry is kinda like a man losing a full erection...sometimes it just happens. It doesn't mean anything went wrong, or that it did not feel good...it just happens. It could be hormonal, situational, positional, the room temperature, a dog barking 3 doors down, who knows. Most people, at some point in their life, have performance issues. How you handle it is what matters. If you make it an issue and it will be one, but if you chalk it up to "eh, shit happens" and maybe give her some extra attention to help the juices flow, things tend to work out fine.