I once had a lover who preferred other things to PIV, and I always accommodated him, but at some point had to say, "I like fucking, and want more of it. I like everything else we do, but if there isn't enough fucking, I'm left feeling hungry. I always accommodate your wishes, so I think it's a bit selfish not to accommodate mine more often. Otherwise, I can't help but be disappointed."
After that, he fucked longer and more often. My request played to his ego, I realized, because he hated the idea of being seen as a selfish lover.