It’s hard to think of older YA books that don’t have at least a little sex in them but when he is 16-18, the Raven King series (very tame mention of both MF and in later books, MM romance, mostly limited to kissing and implied but not explicit sex happening among 18-19yo teens).
If he likes sci-fi:
Ender’s Game
The girl with all the gifts/boy on the bridge duology
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Golden Compass
Harry Potter
Narnia books
Sabriel
It’s hard to think of older YA books that don’t have at least a little sex in them but when he is 16-18, the Raven King series (very tame mention of both MF and in later books, MM romance, mostly limited to kissing and implied but not explicit sex happening among 18-19yo teens).
If he likes sci-fi:
Ender’s Game
The girl with all the gifts/boy on the bridge duology
Red Rising