Define One Thing Lead To Another Meaning

One Thing Lead To Another
The phrase 'one thing lead to another' is typically used as an excuse to justify the act of having a one night stand with a complete stranger(s).

Jennifer: So I met this guy at this party, and we were having such a great time getting to know each other, and before we knew it one thing lead to another and ...
Lily: Did you get his name and number?
Jennifer: ...
By Camila