|Courtesan reading a love letter|
In dictionaries "love" may be given as aisuru (愛する). Ai shite iru (愛している) may be how "I love you" is translated in foreign films, but this phrase is not really used much in normal Japanese speech.
There have been two traditional answers for how to say "I love you".
Words for lover include koibito (恋人) "girl/boyfriend", kareshi (彼氏), "boyfriend", kanojo (彼女) "girlfriend". Koibumi (恋文) means "love letter". Katakana raburetaa (ラブレター) is also used. Other words for love are kesou-suru (懸想する), shibo-suru (思慕する), renbo-suru (恋慕する), and ren-ai (恋愛).
Edited from posts by Tanaka Tomoyuki.
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