Girls, How do you determine the physical boundaries with your guy "friends"? Is it because you would never date them and write them off as harmless?

Anonymous
This is a general curiosity because I've noticed that some girls let some of their guy "friends" get away with far more physical contact than I think is necessary or appropriate.

I'm not very much of a physical person at all. At most I usually just hit a girl on the arm/shoulder lightly or sometimes hug her when I see her that's about it. And I get in Europe the kissy face thing is pretty common.

I think the reason why I am so confused is because 90% of the time the person they let get touchy feely with them is obviously trying to smash or cop a feel, but the girl thinks he is harmless or a genuine friend.

Usually when I ask are they comfortable with that they usually say oh he is harmless or they have no interest in dating him. And the guys isn't always handsome, some times the guy is really fat, super old, or a lanky/skinny nerdy type guy covered in acne.

Things like super long hugs where the guy is clearly trying to push her chest and pelvic region against his, letting him hug her from behind, sitting on his lap, or letting him make comments about your breasts or ask about your sex life.
Girls, How do you determine the physical boundaries with your guy "friends"? Is it because you would never date them and write them off as harmless?
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