With the "Ukiyoe Shunga o Yomu" (A reading of erotic Ukiyoe) published in 2000 as a beginning, he has written many books on Shunga (erotic Ukiyoe) and a red-light district of the early-modern period in collaboration with Yuko TANAKA.
2000年の『浮世絵春画を読む』以来、田中優子との協同作業で春画や近世遊里に関する著作が多い。