I think it's hot when the girl pressures the guy for more sex after he's stroked off a huge load -- pushing him to perform to the breaking point because all that matters is getting herself off.
I remember a funny scene with Brooke Banner and Lexington Steele, where he suddenly needs to cum early and gives her a facial that seemed to catch her by surprise. He declares it's no problem and is able to keep fucking her, and five, ten minutes later he pulls out and again gives her a quick facial before she's prepared. Brooke, having the bitchy attitude she does, tells him he's a "poor warner" (doesn't give her enough warning before shooting cum in her eye). Then, to be an even bigger bitch, she pointedly asks him to fuck her again, as if she completely expected him to be able to do so. He says sure, but then there's a cut and the scene ends -- obviously he was just saying it for the camera. He should have said, "sure, if I can fuck your ass," just to get her reaction on camera.
A friendly version of this was an scene with Asa Akira and Ramon, where she was competing with another girl to perform a whole sequence of sex acts with a guy while judges watched. Well, they got through the blowjob and other warmup stuff, but soon after penetrating her pussy he had to pull out and cum -- very early in the sequence. You could see the worry on her face that her partner had blown the whole deal, and she whispers, "can you keep going??" He answers yes, puts it right back in, and does a great job fucking her all the way to the end when he delivers big second pop. I don't know if she won or not but she did if I were the judge. This was an epic scene because she really needed him to recover from his early fault and fuck her hard nonstop to the end, and he came through.
Another good one was Megan Monroe and some dude, in the Big Tits at Work series -- she plays the boss, that agrees to let him try to pleasure her for a promotion. Partway though the fucking he pulls out early from doggy and unloads long spurts all over her back and hair. She's pissed that instead of making her cum, all he's done is cum early in her hair. He pleads for more time, goes back to fucking her, succeeds in getting her off, and then cums again on her face. Great scene.