Life ebbs and flows and people do also (moods, interests, etc.). Sounds like your husband is feeling good sexually and wanting to share it and you are wanting what you already have. Do you ever play with/tease your husband about sex, initiate it, etc.? Text him back: "Sorry I am all out of plastic wrap so don't be expecting me to greet you at the door wrapped in nothing but!" From then on you will have a good "joke" and one or the other of you will buy the other Saran Wrap as a gift, etc. Beats flowers or candy, a shared laugh like that :-) The whole joke is that the husband looks at the wife who greets him at the front door after work dressed in nothing but the Saran Wrap and a bow and says, "What, leftovers again!"

Sexually, I think men are "simpler" than women and maybe your husband is using what he has/knows to get acknowledgement or attention from you and a little "excitement" into his life? I would change some responses around, think about my masturbation (you say you are not against but still have some reticence about it, want it to be private like going to the bathroom or something, like it is "dirty" in some way?) and maybe explore
"helping" him masturbating him instead of having sex, etc. I would see if I could learn to "play" with him and if that did not help the relationship open up some more so we were both enjoying it more?