I'd say it sounds perfectly normal - after all, dreaming of having sex with a man is exactly that; a dream. Human beings are complex, as is the mind in all its states. Even if you feel the dream might mean something more theres nothing wrong with that either - i mean no one likes being confused, but sexuality is more fluid than we realise, ive known 'straight' men who are married yet engaged in homosexual experiences in the past. I would relax, if you know and feel comfortable with your sexuality accept that this was simply a dream and that its ok to have more in the future without it necessarily impacting on your regular everyday life. All the best.