Anything's possible, but even though you say a fling, as many others do in your situation, you could find yourself really enjoying the continued ego stroking that comes with it and then arrange for another hook up... and then another and... another.... and another... You get my drift.
Then pretty soon you develop feelings, that can cause you to pull away emotionally from your partner /spouse ... You start mentally comparing your OM to your DP/DH who has no idea he's in a competition with another man.
Many women think they can detach love from sex... Sure... A prostitute/escort can... But the vast majority of women struggle with it.
While with your OH in comes the fantasising and thinking about your OM. The betrayed spouses do pick up on this change in character and sneaky behaviour.
Your relationship then suffers and your OH could decide he deserves better than this, these are the consequences.
Now if you think you would be worthy of an Oscar performance, by acting your usual self while betraying your OH to avoid suspicion, that's your call ... But how will you feel afterwards? Living with the guilt of your actions?
Is this who you are deep down? I suspect not otherwise you wouldn't be posting here.
I've learned over time, that as long as another person knows what you did, you can never guarantee it not coming out. The other person being the OM in your case
Even if nobody ever finds out, there's actually nothing worse than the feeling of you yourself knowing you did a terrible thing.
If you are the kind of person who could have an affair and proceed with business as usual in your relationship, then you probably won't face any consequences.