Boyfriend refuses to use lube

So my boyfriend and I have a pretty awesome sex life. He's very generous and well endowed. When we first began dating, I had no problem getting and staying wet. Our living situation requires frequent quickies. Now he complains that I don't get as wet. I tried explaining that lube would fix that issue especially when we are having sex for longer periods of time. He was completely closed to the idea (ego thing. He's a leo). He started talking about how he never had this issue in the past. How can I convince him to get over his ego and try lube?