Women don't exactly want a guy who lasts too long. As long as you both get your jollies and liked it there isn't a problem. 10 minutes is long enough. If a girl gets hers it's like getting into queue for the bathroom after a delightful roller coaster ride. Oh, and you're waiting on your partner, because he's stuck in his seat and so the ride still isn't over...And since she got hers she is actually concentrating on whether she left the stove on or what she should do about her hair because she hates it and is considering chopping it all off...Never thinking about that sandwich she should make for you after sex. Never.
Now, what I can suggest to you is grabbing bottle spray of desensitizer. It can be labelled differently depending on where you live. It's just 2% lidocaine mixed with alcohol for better absorption. Put it on as directed in the area that is most sensitive, wait for a couple minutes, masturbating and mount your lady after it is fully absorbed so it doesn't affect her sensitivity. You will last longer, though your brain determines when you ejaculate, not your penis. Some of these lidocaine sprays come with a mint flavour or some random taste for oral use, allowing for newcomers to perform oral without likelyhood of gagging. I, myself am very sensitive, but I don't ejaculate at the preferred 10 minute mark. Instead I either don't orgasm because it's taking too long or just every time I cum it gets so sensitive my glans feels over exposed and a finger print feels like sandpaper on a wound or so sensitive I don't want to thrust during the twitching, which feels more like a ruined orgasm to you. My foreskin has nothing to do with it. I don't like genital cutting so I use the spray and it helps putting it on a small area to feel great.