MoT - why is it controlling to expect monogamy from marriage? to say that the comments have been negative is true. they have. but you haven't really encouraged sympathy at all. not that you would get much, i expect. you are right in respect of the fact you haven't actually embarked on an affair. well done for your restraint. what grates, i think, is the fact that you expect him to somehow relish the opportunity to get his end away with someone else, whom you have implied, chosen by yourself. can you stand back a little from your own self and see the other person's standpoint.
this man thought he would be with you for life, thought that you would be the last woman he slept with. to find that the woman then turns around and says 'i don't find you attractive and frankly i don't want to sleep with you' is probably a mite galling and crushing for anyone. to try and qualify it and say 'but i don't want a divorce. oh no, i just want to sleep with other men. and i'll probably tell you about too. don't worry though, i'll let you do it as well. perhaps we could have a foursome?' its not really cricket, is it?
i think, what is also grating, is the fact that you derided the opinions that you invited by starting the thread. we didn't kowtow to your automatic way of thinking and thus, whatever anyone said, it would be wrong.
you are, at least on the internet, a rather opinionated, self aggrandising, self absorbed creature. and, generally, most importantly, not a nice person.
so toddle off and sleep with whoever you like, knowing that you have broken something (i'll spell out what, for all your comments, though intelligible, are not intelligent - marriage) which you may not have wanted to break.