I tend to let the girl cum first. When I feel her muscles tensing and releasing, I know that it is time for me to thrust harder, to make myself cum ... to cum inside her.
One of the hottest things, I find, is that gel like substance that comes out when a girl cums. I think it is so cute, that a girl can secrete this soft, stringy, stretchy substance - just like a guy can cum.
I don't really get pleasure out of a fuck - true pleasure - unless she has also cum, and this, generally, must involve her cumming first. Otherwise, it is me cumming inside her, then her rubbing herself to climax with my cum inside her, which she sometimes does for a second time after I have made her cum the first time and cum inside her myself.