Be honest and upfront about the idea. Express your reasons for wanting to make the relationship polyamorous.
[header] How to practise polyamory [title] Raise the idea of polyamory with your partner in a private setting. [step] If you are in a monogamous relationship and want to explore polyamory with your partner, bring up the subject at home. Find a time when your partner is open to chatting, such as after dinner or before bed.