i think shes definately realised its meant to be sung by a guy, but since she released it in the 80s era and she was portrayed as "weird" for her dress sence and hair styles she probably thought it would be funny to sing a song that was meant to be sung by the opposite gender so that she can encourage that "weird" image, that and she must of loved the song too. That's my opinion on the matter.
i think shes definately realised its meant to be sung by a guy, but since she released it in the 80s era and she was portrayed as "weird" for her dress sence and hair styles she probably thought it would be funny to sing a song that was meant to be sung by the opposite gender so that she can encourage that "weird" image, that and she must of loved the song too. That's my opinion on the matter.