And since I'm in the mood for dying on hills: a one-night stand, even if you abbreviate it to ONS for whatever reason, is not a premeditated choice. I feel like I'm losing touch with humanity...
I'll try to explain: if we meet for sex and we like each other, we'll probably meet again. Hey, we might even have some pillow talk and get to know each other. If, on the other hand, one or more of us didn't like the experience, it would be silly for us to force ourselves to meet again.