Bf Sex drive TOO HIGH

my bf sex drive is becoming overwhelming. He wants to have sex ATLEAST 3-5x A DAY! Way too much! My sex drive is in the middle like I love being intimate with my man but I just want to cuddle ... sometimes it feels like a chore bc it's too much! I dont even be in the mood,  I do it so he don't catch a attitude or get mad at me but i am serious drained from all the sex and keeping up with him. He is 40 btw and sex drive is like a teenager and I am 20 so you'll think it'll be vice versa. We are ttc but I think bc he wants it so much is the reason I am not pregnant! Also he believes since I am 20 I want sex 24/7 but that's far from the case! He believes keeping me sexed up I won't cheat but that's the furthest from the case too. I would never cheat bc he gives me TOO much love and affection I have no reason to want another man.. Idk what to do or say to make him chill bc im effin tired!