Is it okay to go out with my y hot niece other than my wife?

Well since my wife won't go out with me nowhere, sometimes I hangout with my young nieces in their early 20's. We go out dancing, hanging out and partying out sometimes, but yesterday my y hot niece invited me to watch the movie "Wanted". She dresses very sensual, if feels weird going out with a woman [my neice] that dresses so hot, y and sensual. But in any case, she's a very cool, smart young woman. She is so adorable to constantly asking me out on many dates. I always ask permission on this-my wife usually approves this, because she is my neice. My wife knows that she is somewhat a crazy young girl that likes doing crazy, silly funny stuff just like that of a teenager girl. Thanks