My BF usually starts to really pound away when he's close and will give me some really hard thrusts during the first few seconds of coming - then he stops while his cock pulses a few more times, always making sure to be as deep inside me as possible. If he fucked me doggy, he'll lay down on me afterwards, almost burying me below him (he's 6'4", 210 lbs of muscle, I'm more of a twink) while his cock is still inside me. Getting a load pumped deep inside me is maybe the biggest turn-of of getting fucked for me - much more important than actually coming myself. I always keep his load inside me as long as possible.