Ok here it goes....

I'm very active with my girlfriend and we have sex atleast once everyday and its a great experience but im just wondering; When we start i will cum in like the first 15-20seconds but the thing is sh*t all comes out and i stay erect for a good hour or so and it really doesn't bother me at all and longer sumtimes and then i blow normally but i still dont go down..

Im just wondering (even though it doesn't affect during sex) it effects me during foreplay because it looks like i've cum and even though my girlfriend knows and i do stay errect it just makes me feel a bit silly so i was wondering if there was anyway to stop this or lessen the chance of it happening?