Well since these are porn games every girl is trying to seduce the mc
. But here are some recommendations of games where you have a significant other and you can choose to cheat on them.
WVM ( Your significant other is a girlfriend. Everybody tries to seduce the mc. Pretty solid harem game pretty much every female is fuckable.)
My Girlfriend's Friends ( Your significant other is a girlfriend. She has a group a friends you can pick which one you pursue. Few of them will try to seduce you but mostly you have to pursue. Very solid game I enjoyed it)
Babysitters (Your significant other is your wife. Little more on the kinker side, women will try to seduce you and you can even turn your wife into a cuckqueen. Multiple paths depending on your choices. There is NTR in this game but it's avoidable with the choices you make.)
Deliverance (Your significant other is either your wife or girlfriend not sure it's been a while. I'm not a huge fan of this game. Multiple women will try to sleep with you, you can also start sharing your wife but it can be avoided with choices you make.)
Dr.Amana Sexual Therapist ( Your significant other is your wife. Very solid game sadly it's abandoned but has decent amount of content. Multiple women will try to sleep with you. You can pursue as well, also you can either be kind or more corrupt depending on your choices.)
Midlife Crisis (Your significant other is your wife. Man this game is one big fuckfest everybody fucking. Multiple women will try to seduce you, some will take advantage of you while you sleep. I had to delete this one to much depravity to me but you may like it.)
These are the only once I can think of off the top of my head. Hope this helps you.