A friend of mine has some diseas that makes him unable to father children, also he has a genetic diseas that if he could father children then his children would inherit it with high chances and no one wants to see their children die before them.
So they opened up the relationship and his wife had encounters with other men, always unprotected and kept that for ~1-2 years. It didn't work
Then they had friends living in the same house, the wife and she are friends and also their husbands are friends. She has multiple children and always boasted that her guy would get anyone pregnant ....
So they tried. Every month when she was ovulating he would fill a cup with sperm and his wife would bring it to my friend, then she would use a device to pump it into her womb.
After nearly 2y of this procedure, getting on a strict diet and everything else to improve the chances of having a baby they finally achieved it, it's 3 month into the pregnancy now and they will get their child next spring 🙂.
His wife is finally happy, she suffered soo much from that. I hope the best for them.
So there is always some way to make it without fucking other guys, maybe this is the best outcome for them, at least they are friends and she knows if the other guy has diseases or other problems, they will keep in touch.
I think fucking around COULD make her pregnant, but there is a certain risk if you don't choose the partners wisely.
My post is just to tell how it can also be done. The fact that you ask this question in a cuck forum might indicate that having your wife fuck around is something you would like.