I never have that problem with the cocks I ride. Before they even get inside me, I have their cock all the way down my throat.
While it's down past my tonsels, I lick their balls with my tongue. It takes some practice to do that, but they blow long heavy loads of cum down my throat in no time. then I clean them off, and they lick and drink all the honey flowing from me. Soon enough, they start pumping away and it takes them much longer to blow the second load. Most are good for 30-40 minutes of constant fucking. Any longer than that, and I get real sore. In the meantime, I've had 3-4 more orgasms. If they're real good, they go from the pussy to my ass and dump load #3 there. That's good for a few more orgasms.