Sleep with a ex lover or ex sex partner

So we have this burning question for all swinger couples would you let your partner sleep with a ex lover or ex sex partner that you so happen to meet in the lifestyle

This is a person that your partner hard sex or one night stand or regular booty call with before you 2 met and before the lifestyle now you and your partner meet them in the lifestyle would you let them play together

I met my ex lover at a club and we had a great time, still in contact with her

I have let my wife sleep the night with her lover, and did not mind at all.