Then you may end up with the last seat only being available for people willing to sit next to a man. The odd man out can still share a three seat row with a wom

Then you may end up with the last seat only being available for people willing to sit next to a man. The odd man out can still share a three seat row with a woman if they sit in the window and aisle seats. But otherwise, apart from that last middle seat (or one of the seats in a two seat row) there shouldn't be any complications if all women spurned sitting next to men.