So what about one night stands, do they qualify as cheating? Yes technically one night stands are infidelity because you're sharing yourself sexually with someone else. Given the fact if you would never see the person ever again, of course, it's much more forgivable than an on going affair. Something where you've invested time, energy, intimacy, resources in.
A one night stand is something much more likely to be forgiven by a partner than something that's more involved. Particularly women, women are likely to forgive a one night stand, and likely to prefer a one night sexual stand to an on going emotional involvement of their partner with someone else.