Reasons are obvious: It is free, it is near you, and it is best way to get laid fast, just going to local bar, club or some other popular place.
You can even visit less popular places; it depends on how you see your chances.
looking for women, men, and couples that want to have fun hot in bed. We have been happily married for 14 years and are both very aroused at the thought of introducing another woman into our sex life.
Or to be more precise: sex with somebody that you (or another person) will NOT see nor have sex again. Because on that way nobody don't have any commitment, just pure sex, sometimes good sex sometimes bad sex, but anycase just sex and nothing more:).
Check also what wikipedia says about one night stands.
How to land a One Night Stand How / Where to find online one night stands Choosing partner for 1 night stand Can a One Night Stand Turn Into a Relationship Escape the friend zone to get sex Asking girl a for one night stand How to act after one-night stand What can go wrong after Top X Tips and Tricks Many people are confused when it comes to understand what one night stand is.
To be clear with this: one night stand is a single sexual encounter with another person, regardless of any expectation of further relations.