Why girls let other guys hold, hug and kiss even they are not couple?

I seen and experience a few. Its a skill of interrogation if a person is uncertain they have alot in their mind that they didnt tell you so they hesitate awhile. Like if someone is lying their eyes will always move or look away when they answer.

This is just my opinion. Even my previous partner similar she give uncertainty then she said Yes after 5 days later i ask back why you hesitate but said yes then she give tons of reasons. But within that time frame i proven her i am worth so much after 3 weeks later i ask again and i get a straight YES without  any hesitation and with that i am still with her today

is it because of your face ? 

Nope why must everything be about face like I said its depends on the maturity and experience of the gal.

If the gal easily say yes usually very simple and vision + direction is not clear
Those more challenging to get they tend to be harder and require more creative approach.

Erm, relationship that start easy ended up fast?

Dey macha, people been marrying each other for centuries without dating first and those marriage normally last a whole lifetime.

old timer different geh 

last time no internet

Ah I see, high speed relationship.

So in order to have long relationship, need to cut Internet?

Seems legit!

not only that, must cut handphone 

I believe you just call your gf stupid, lawl.

I believe you just call your gf stupid, lawl.

she isn't, why weak minded sounds like stupid?

if its yes, not yes yes, why she allow him to kiss kiss hug hug leh?

It don't think it's uncommon to see guys and girls touching or kissing one another if they're not a couple.
Sometimes skinship are just natural, and you go along with the flow.