Yes it certainly is but its something people most often draw comparison with. At least some people I know do.They are like "how can you allow your man to go sleep with another woman? then you must be ok with him going to prostitutes as well" sort of thing! And then one needs to explain to them how having another wife and having affairs is certainly not the same.
Sadly Nom I know too many people who would and many times do put up with their husbands sleeping around but claim will do something crazy like even kill themselves(or him even) if he is to take another wife!