don't know
Dungeon & Bride (bookmarked now

), but maybe
Virgin's Protection Magic ?
female MC, no character customisation, not strategic but plain turn-based.
Outside towns you can undress or have your clothes destroyed in battles and then battle nude. ("You can keep your hat on" for stats

)
Inside towns you need to raise your lewd stats - all while keeping your virginity - to undress, first you can nothing, then go no-pan, and so on.
sex battle scenes are small animations, and you get detailed settings for showing already seen ones or not.