Here's my take; I hope it helps. I masturbate because I have sexual needs that are not being met otherwise. Without masturbation, I could not function well in other parts of my life. Like all sex, sometimes it is more enjoyable and sometimes it is dull and merely a means of relaxing/relieving my nervous system. It also functions as a form of playtime. If you are lonely and in need of companionship and love, then masturbation is not meeting your needs and the sex can feel empty. A real partner / playmate is more fun - though not as convenient! - than a sex toy any day. Try adding some variation and don't be shy with your partner, e.g., I like you but there are times when I like doing it alone - that's just me being me!