Ever 17: The Out of Infinity is very very good and to my knowledge doesn't contain any sexual content - I think there is a smattering of romance but it's not the main thing.
I played it like 12-15 years ago though so may be misremembering some things!
Yeah I have no skin in the game on exact figures being higher or lower, I just think it's incredibly sad that hundreds of thousands of lives are thrown away on something as hopelessly pointless as this :)