I think you are a very wise man.
I have told him that I found the communication upsetting as I wouldn't send these emails to another man. I did try to turn the tables by asking him to think how he would feel if I was to recieve the same emails from another man but he can't/won't see any problem.
Thus comes the crux of it all, how much do I accept this behaviour.
Thank-you so much, you have given me a lot to think about.