I don't think the concern is with what is "allowed" but rather what do people want. I personally do not want to be intimate with other men and I have never been with a man who was in a relationship with me but wanted to be intimate with other women. In order for you to maintain the life style ( be with more than one partner) you have to find someone who is into it too.

I agree with Lolagrace it's not uncommon and not boring ( to be with one partner) I can't say I am spending my life with one man as my marriage and long relationship didn't work out but it was still monogamous and intimate.

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