sex and weight

My boyfriend and I have been together for three and a half years, known each other for 7, and are very comfortable with each other. We've both gained a bunch of weight and are fairly uncomfortable with our bodies now. I kinda feel like it's affecting our sex life, like he has less of a libido and I'm less confident. We're both about to start our weight loss journeys, so I'm wondering if anyone else feels this way or has felt this way. Also, has anyone whose lost some weight or their significant other has noticed a change in their sex life? I'm super curious so let me know.