User blog comment:B214/Question and Answers 3/@comment-4547267-20140618023446/@comment-16281343-20140618035203

What about his dream? Marrying Rias doesn't mean he can't still have a harem. Venelana even told Rias that he should learn on how to manage Issei's harem just like how Venelana manages Lord Gremory's (not stated but implied).