Help!!! Husbands sex drive

My husband is only 24 and has little to no sex drive. I have put on some weight and felt like the decline fell in line with the gain but he swears that is not it. I totally don’t wanna make him have sex because that’s no fun for either of us and plus it just feels wrong. But we are TTC and only doing it 4 times a month isn’t cutting it. I just don’t know what to do I mean how can I make it more fun and ramp his drive without being hateful or hurtful and feeling horrible about how bad I want it:(