I'm not taken ever (there is life beyond monogamy).
However, i suppose what the poll is meant to represent with single is - well, not in an interpersonal love relationship. I'm currently not. I feel neither overly euphorious nor sad - just "satisfied", but that wasn't a poll option, so i did choose "happy". I wouldn't say no to an open relationship, but considering that in my experience it often brings more frustration than satisfaction, it would need to be seriously different from what i know, for me to bother. I don't feel that i "need" love relationships anymore - but if they're good, then they may do something beyond "satisfaction".
However, i suppose what the poll is meant to represent with single is - well, not in an interpersonal love relationship. I'm currently not. I feel neither overly euphorious nor sad - just "satisfied", but that wasn't a poll option, so i did choose "happy". I wouldn't say no to an open relationship, but considering that in my experience it often brings more frustration than satisfaction, it would need to be seriously different from what i know, for me to bother. I don't feel that i "need" love relationships anymore - but if they're good, then they may do something beyond "satisfaction".