If you fucked them the first "date" and they didn't want any dick the second time you hang out, then you are DEFINITELY NOT pouring the peter correctly. Just try to watch more porn and you'll eventually get better.
From my experience, girls who usually want to "take it slow" have some sort of bush/pussy stank issues or their puss looks like a catcher's mit. They may also have redneck titties that they are embarassed about or they are usually self-conscious about their weight. There is, however, there is a small chance that she is a nice, hot, and intelligent girl... but this is highly unlikely.
Any one final note, if you want to fuck right when you meet a girl... YOU GOTTA EAT THAT SHIT!!!