Most Helpful Guy
Normally if you're laying down and cuddling with someone a lot of the times sex just happens but either way I mean for a guy the best way to handle this type of situation is being clear and honest so he doesn't get any wrong idea because most girls tend to say stuff like I only wanna cuddle but no sex but they tend to only say it to not sound like a whore in their eyes or they try to cheese it up which makes it very confusing for a guy.
My answer is yeah tell him straight up you want to cuddle and lay down but you're not interested in sex right now and want to further the relationship first. Simple as that and the guy gets the message clear as day and isn't trying to figure out what you meant if you try to say it without being so noticeable etc.
Most Helpful Girl
Just say you want but, not in that way. He won't know until you tell him.