Is it sinful for priests or/and those in state of religion (eg. Franciscans, Dominicans, etc.) to hug women (of course, we are not speaking of hugging mother, sister or something like that)?
We can see this happen publicly on the show The Voice (about 7 minutes and 45 seconds in the video). Also, I see many examples in the youth groups where the priest becomes (very) friendly with the youth. So, obviously those who have authority are seen to do such things and I have seen no one to reproach them; so it seems that they are not doing anything evil.
It would seem that all hugging between male and female (which are not husband or wife or are family) is sinful (so for a priest or religious it is also a sin). For it is mentioned as a sin in the Eisenger Confessionale p.180:
qui deliberate exosculatus aut complexus fuit vel tetigit mulierem (who deliberately kissed, hugged or touched woman)