Listen, it sounds crazy, but I know it works. When you're laying there after finishing, instead of falling asleep, start listing everything they did that turned you on, kiss them, neck, just because that particular orgasm happened, doesn't mean sex is over. Get turned back on, work that refractory time.
Men have multiple orgasms, they may take longer, but trust if you work hard enough, you can have them, and your partner will appreciate you more for it