Personally i never came "during sex" by itself... i like it, but im not able to bring the juice during it... Got to admit i never really tried hard anyway as i pretty much take CIM avalaible escorts and i never had sex outside an escort...
So when it comes to finish, i prefer being on my back, with a CIM or COF, but sometimes i managed to get it off by me being on top of the girl with my 2 knees beside her head and finishing off either cim or cof with that.