brother and sister hook up by accident

All I can remember about this movie is that a boy meets a girl in a dimly lit room, and they are kissing, or groping, or something.  Anyway they find out that there are brother and sister, don’t remember how they found out.  I think he is looking on the net, or something and reads that she will be at some place in a dark room, or something like that.  It was a color movie, don’t remember when I saw it. I believe it is a comedy.  Any help would be greatly appreciated, Thanks.

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