The NSA is no strings attached. This means that people are interested in an unconditional relationship or are currently in the relationship, which basically means nothing but intimacy. These are the physical aspects of the quick flirt relationship, not any emotional aspects, with no strings attached, because no emotional attachment is formed.
In the past few decades, the term has been widely used in dating cultures, although the concept of no strings attached is not new. If you happen to have a pure sexual relationship with some nsa finder, then it is considered to be the quick flirt relationship of the NSA. This person may be someone you occasionally hook up on, or it may be a one-night dating that you have never gone further or the past is, and now it's just about intimacy.
In the case of online nsa hookup, when an adult affair finder is looking for the NSA, it means that they are only interested in intimacy, do not want to start dating or become serious relationship, just with adult friends who share their interests.
What is FWB?
FWB is an abbreviation for friends with benefits. This is a casual relationship between two friends who happen to have intimacy. They can be friends for a lifetime or new people. Their main idea is that you have a friendship and occasionally have date. In an online fwb dating environment, few adult affair finders look for friends who are good for themselves, because most FWBs start with people you already know.
All these adult friends on fwb dating sites don't usually look for friendships in casual sexual behavior. Anyone who wants random hookup usually uses the word NSA instead of FWB. This is not to say that you have not met someone who wants a FWB type relationship when you are dating online. Some are looking for friendship and hookup without any burden.
The difference between NSA and FWB. The relationship between NSA and FWB has some obvious similarities, such as its main concern is intimacy, not a single date. You can also technically consider FWB to become an NSA, because there are no strings attached to friends with benefits.
FWB is start with a friend, and NSA can start with anyone. As the name implies, friends with benefits refers to sexual relations with adult friends. It can be someone you have known for a lifetime, or someone you know a few years ago, or someone you have known recently. On the other hand, the NSA does not need to happen with friends. Yes, you can hookup with friends of the NSA, but if this happens more than once, you are more like FWB than anyone else.
The NSA can happen to anyone, whether it is someone you meet at the bar or someone you meet on tinder free dating sites. You don't need to know each other before or after you have NSA hookups. NSA only cares about intimacy. Intimacy without any strings of conditions. As long as you meet, you want to make love, then break up.