Women are actually open to this ONLY when they perceive you as high value AND of being a dominant personality.My ex was cool with polygamy on my end only (no I never exercised it). And a female friend of mine who’s been married to her husband for 7 years is ok with it. And 2 other of my boys who are married are allowed to bang other girls.
Naturally dominant men tend to stick by their women even when they sleep around as they are naturally dismissive.