Until you are divorced you could be held on adultery charges. Separation, even legal separation does not allow. Now, If you would like to date and even have sex with someone IF you get permission (preferably written in today's world) from your spouse then you can.
Any married couple, in a good marriage or not, can give permission to have a relationship outside the marriage. I do not recommend this for a poor or shaky marriage as it will tear the marriage apart. The term for this is "polyamory" and is widely practiced by many couples today. If you would like more information on polyamory see www.lovemore.com . Biblically this is based on Exodus 21:4 (KJV).
Any married couple, in a good marriage or not, can give permission to have a relationship outside the marriage. I do not recommend this for a poor or shaky marriage as it will tear the marriage apart. The term for this is "polyamory" and is widely practiced by many couples today. If you would like more information on polyamory see www.lovemore.com . Biblically this is based on Exodus 21:4 (KJV).