If your partner knows about it and is ok with it? No. In any other context? Yes.

If you’re keeping this from your partner, the fact that it’s not recognizable/traceable doesn’t make it better, it just means you know what you’re doing is wrong and you’re taking steps not to get caught.

If you’re serious about this question, you should not be in a relationship. Regardless of whether it was you or your partner doing it, if it was hidden from the other person, it’s cheating.