If you're looking for anime similar to L'Amant: Koibito, you might like these titles.
Hikaru Genji is a son of the emperor, born on the wrong side of the sheets. A commoner at birth, he works as a retainer for his father. Though his good looks ensure him the attention of the ladies of the court, the love of his life happens to be his father's wife; and that's where things become a little more complicated. Forced to seek love elsewhere, he leaves no stone unturned; but can he ever find what he truly wants?
Ziming, a University undergraduate, is entangled between his amorous feelings for a self-exiled mother Mrs Yu from Taiwan and her beautiful daughter Meiling, in the era coincides with Hong Kong's turbulent times of 1967.
Bereaved strangers lose themselves in a sordid double life of prostitution but find love with each other. A loveless marriage blossoms through bondage. A trainee gets more than she bargained for when the head nurse takes the biology lesson to the limit. And a male beautician uses unorthodox methods to put color in a makeup artist's cheeks.
Three people from the future are spiritually sent back in time to relive the era of Caesar, Marc Anthony and Cleopatra. As close companions to these key historical figures, they seek to understand the nature of an enemy's plan in their own time.