Unfortunately, it's sad to see how some people skew this. Some of the examples I've seen are:
* The girl who's "kinda sorta" seeing this guy... They spend time together and sometimes kiss and act like a couple but they're not "officially" dating, so... Whenever she goes to a social event, she lets all the guys she's interested in know that she's "single" and available.
* The guy who believes the only sexual sin covered in the Bible is adultery. Therefore, if he's not married, but sleeps with married women, THEY might be sinning, but he isn't, because he's "single."
* The people who spend all their free time with a special person they met online and their hearts are definitely invested, but... for any other given purpose, whether a social event in real life, or an opportunity to chat with someone else online who sounds interesting, they insist they're "single"--and supposedly rightly available, even though this other person obviously has a serious piece of their heart.
I'm not saying any of this in condemnation (though of course I don't agree with many of these perspectives), but rather, just a few things I've observed in the shark tank of dating.
As I wrote in the other poll, I think one of the biggest challenges now days is trying to figure out if someone REALLY IS "single" and available (which includes emotionally, if, for example, the person is vested in an online relationship.)