Female perspective
Need to talk before you move in, so you don't have to move your stuff twice. Get ready though because when you first move in it will be on! He'll be like a kid with a new toy. Tell him that you love yall's time together, but also need time alone to recharge. (meaning if your happier then more receptive to sexual advances) Tell him how you get sometimes around alot of people and that its not him but you. If he agrees then come up with code signals when youve had enough and need to leave. Me and mine like to joke around, he even came up with other signals that meant other things...if you know what I mean. Very funny, still laugh when he does one.
If you think he won't go for that, then you'll have to do alot of "grocery" store trips to be alone.
The sex thing,, that's normal. If he really likes you it's more. I don't mind it at all. I give mine whatever he wants when he wants it. Mine is very giving back, I'd have a hard time doing that if it was only me giving. If he's all over you one day and won't leave you alone, then he's really horny. I know what you mean, following you around. Whispering in your ear. Grabbing everything you got? Next time turn around and face him. Whisper in his ear... Want a Quicke or something like that. After sex he'll go away for a little while.
I do like my alone time too. All I have to do is look at him a certain way and he'll say "me or you", meaning who's leaving. I'll leave for an hour or so come back.. recharged.
If he's not willing to listen to you and compromise, then you need to rethink your relationship. Things that bother you now will be like 10 times worse later.