Contrast with Foreplay
and place where Phone Sex falls between them, if it indeed does fall into these categories.
This is a very important question and necessary to developing the field of Marxian study. 
Contrast with Foreplay
and place where Phone Sex falls between them, if it indeed does fall into these categories.
This is a very important question and necessary to developing the field of Marxian study.
Flirting is signalling and maneuvering to test and tell interest while being socially deniable enough for everyone involved to ignore without social consequences if the it doesn't lead to anything.
Foreplay on the other hand is often physical and distinctly sexual. An act of foreplay without consent would earn you social consequences, an act of flirting will not, unless you've been asked not to do so or there are other factors that make the flirting inappropriate.
The difference in how far one goes before becoming the other is entirely based on the social consequences line.
this is actually gets to the core of what i've been thinking about, watching some older TV, that included what I would consider unacceptable 'flirting'.