Ok, so let's start at the extremes. As an example - hugging is clearly not sex, on the other hand sex is, well sex. That's clear, end of story.
Now me move to the more gray area. Kissing - Most I think would agree that this is not sex, but I'll include it just to make sure.
Now we move closer to the middle and lines start to get drawn. We have oral and hand stimulation (hj/rubbing or fingering her downstairs) My line gets drawn between hand stimulation and oral. Ex: A hj is not sex, while oral is sex.
So my question: What do you consider "sex"? Kissing, hand stimulation and oral are the three. So for me it looks like this:
Kissing - Not sex
Hand stimulation - Not sex
Oral - Sex
Also, feel free to expand upon why you answered the way you did. Thanks