That is funny because I just saw an article
on kissing in the Bible. It quotes a few verses like Romans 16:16, 1 Corinthians 16:20, 1 Thessalonians 5:26, 1 Peter 5:14 and 2 Corinthians 13:11-12. One example of the quote is
"Finally, brethren, farewell. Be perfect, be of good comfort, be of one mind, live in peace; and the God of love and peace shall be with you. Greet one another with a holy kiss." — 2 Corinthians 13:11-12
So it seems that kissing other people outside the relationship should be ok. I would think a hug is milder in comparison.